Human Body Systems
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
The Digestive System
SubtopicThe Digestive System under Human Body Systems for Grade 7 IB.
Preview questions (no answers)
- 1.
Where is the stomach located in the human body?
A.In the lower right abdomen
B.Behind the lungs
C.In the neck
D.In the upper left side of the abdomen
- 2.
Why is chewing food important for chemical digestion?
A.It adds more water to the food
B.It makes the food taste better
C.It increases the surface area of food for enzymes to work on
D.It removes sugar from the food
- 3.
Which type of chemical substance speeds up the breakdown of food molecules?
A.Hormones
B.Enzymes
C.Antibodies
D.Vitamins
- 4.
What is the name of the first part of the small intestine where most chemical digestion continues?
A.Duodenum
B.Ileum
C.Jejunum
D.Colon
- 5.
What happens to the 'products' of digestion after they are absorbed into the bloodstream in the small intestine?
A.They are sent to the large intestine for storage
B.They are transported to the liver and then to cells for energy and repair
C.They are converted into bile
D.They are immediately excreted through the kidneys
- 6.
If a person's large intestine fails to function correctly, what is a likely medical symptom they would experience?
A.Inability to swallow food
B.Severe dehydration due to lack of water reabsorption
C.Inability to digest proteins
D.High levels of sugar in the saliva
- 7.
Which of these is a component of gastric juice?
A.Bile
B.Amylase
C.Hydrochloric acid
D.Insulin
- 8.
What is the primary role of the 'Lower Esophageal Sphincter' (LES)?
A.To grind food into smaller pieces
B.To prevent the backflow of acidic stomach contents into the esophagus
C.To signal the brain that the stomach is full
D.To absorb sugar directly into the blood
- 9.
How does the digestive system contribute to the body’s 'Internal Environment' (Homeostasis) regarding energy?
A.By keeping the body at exactly 37°C regardless of external conditions
B.By converting complex chemical energy in food into a form (glucose) cells can use
C.By removing carbon dioxide from the blood through the anus
D.By producing red blood cells to carry more oxygen
- 10.
During a medical exam, a doctor notes that a patient’s 'amylase' levels are high in the blood, but their 'pepsin' levels are normal. Which organ is likely malfunctioning?
A.The Stomach
B.The Pancreas or Salivary Glands
C.The Liver
D.The Gallbladder
Download the worksheet for Human Body Systems - The Digestive System to practice offline. It includes additional chapter-level practice questions.
The Respiratory System
SubtopicThe Respiratory System under Human Body Systems for Grade 7 IB.
Preview questions (no answers)
- 1.
Which gas makes up the largest percentage of the air that we breathe in and out?
A.Oxygen
B.Carbon dioxide
C.Nitrogen
D.Water vapor
- 2.
What is the purpose of the 'yawn' reflex?
A.To remove food from the throat
B.To take in a large amount of oxygen quickly
C.To stop the heart
D.To help with digestion
- 3.
What is the main substance that lines the trachea to trap dirt and pathogens?
A.Water
B.Mucus
C.Blood
D.Saliva
- 4.
Which part of the brain is mainly responsible for controlling the rate of breathing?
A.Frontal lobe
B.Brain stem
C.Cerebellum
D.Occipital lobe
- 5.
Which event occurs during the process of exhalation?
A.The diaphragm moves down
B.The intercostal muscles pull the ribs up
C.The volume of the chest cavity decreases
D.Air pressure in the lungs becomes lower than atmospheric pressure
- 6.
What is the primary role of red blood cells in the respiratory process?
A.To produce oxygen from carbon dioxide
B.To carry oxygen from the lungs to the body cells using hemoglobin
C.To protect the alveoli from bacteria
D.To signal the brain to breathe
- 7.
Which of the following accurately describes the structure of the bronchioles?
A.Large tubes with thick bone protection
B.Small, branching tubes that lead from the bronchi to the alveoli
C.The main tube that connects the mouth to the stomach
D.The sac-like structures where gas is exchanged
- 8.
How does the 'Total Lung Capacity' differ from the 'Vital Capacity'?
A.Total Lung Capacity includes the Residual Volume, while Vital Capacity does not.
B.Vital Capacity is the amount of air inhaled, while Total Lung Capacity is the amount exhaled.
C.Total Lung Capacity is only measured during exercise, while Vital Capacity is measured at rest.
D.There is no difference; they are two terms for the same measurement.
- 9.
If you were to trace a molecule of from a muscle cell to the outside air, which of the following is the correct order of the blood vessels it would travel through?
A.Pulmonary vein -> Heart -> Pulmonary artery
B.Systemic vein -> Heart -> Pulmonary artery -> Capillaries around alveoli
C.Pulmonary artery -> Heart -> Systemic vein
D.Capillaries around alveoli -> Pulmonary vein -> Heart
- 10.
The trachea branches into two main tubes. What are these tubes called and what is their primary structural feature?
A.Bronchioles; they are thin-walled and have no cartilage.
B.Bronchi; they contain cartilaginous rings to maintain an open airway.
C.Alveolar ducts; they are surrounded by smooth muscle for gas exchange.
D.Capillaries; they are one cell thick to allow for diffusion.
Download the worksheet for Human Body Systems - The Respiratory System to practice offline. It includes additional chapter-level practice questions.
The Circulatory System
SubtopicThe Circulatory System under Human Body Systems for Grade 7 IB.
Preview questions (no answers)
- 1.
Which of these describes the shape of a human red blood cell?
A.A long thin string
B.A flat biconcave disc
C.A perfect sphere
D.A star shape
- 2.
Which part of the blood is responsible for carrying dissolved glucose (sugar) from the small intestine to the body's cells?
A.Red blood cells
B.White blood cells
C.Platelets
D.Plasma
- 3.
What do we call the force of the blood pressing against the inside walls of the arteries?
A.Blood pressure
B.Heart rate
C.Pulse
D.Diffusion
- 4.
Which component of the blood is a cell that lacks a nucleus when it is fully mature?
A.White blood cell
B.Red blood cell
C.Plasma cell
D.Nerve cell
- 5.
If you compare an artery and a vein of the same size, which one will have a larger 'lumen' (the open space inside where blood flows)?
A.The artery
B.The vein
C.They both have the same size lumen
D.Neither, as capillaries have the largest lumen
- 6.
What role does the liquid 'plasma' play in maintaining homeostasis in the body?
A.It helps regulate body temperature by carrying heat
B.It is the only part of the blood that carries oxygen
C.It creates the electrical signals for the heart
D.It thickens the blood so it doesn't flow too fast
- 7.
Which blood vessel is responsible for taking blood away from the heart to the lungs?
A.Aorta
B.Pulmonary Artery
C.Pulmonary Vein
D.Vena Cava
- 8.
In a closed circulatory system like that of a human, how does the 'interstitial fluid' differ from 'blood'?
A.Interstitial fluid lacks the red blood cells and large proteins found in blood
B.Blood is found outside of vessels while interstitial fluid is kept inside
C.Interstitial fluid carries oxygen while blood only carries carbon dioxide
D.There is no difference; the two fluids are identical in composition
- 9.
Which statement best describes why 'arterioles' are often called the 'resistance vessels' of the circulatory system?
A.Their diameter can be adjusted by smooth muscle to regulate the flow into capillaries and control blood pressure
B.They have the thickest walls of any vessel to resist the high pressure from the heart
C.They contain valves that offer resistance to any blood trying to flow backward
D.They are the only vessels that can resist the buildup of cholesterol plaque
- 10.
The 'P-wave' on an Electrocardiogram (ECG) represents which electrical event?
A.Atrial depolarization
B.Ventricular depolarization
C.Atrial repolarization
D.Ventricular repolarization
Download the worksheet for Human Body Systems - The Circulatory System to practice offline. It includes additional chapter-level practice questions.
Nutrients and Malnutrition
SubtopicNutrients and Malnutrition under Human Body Systems for Grade 7 IB.
Preview questions (no answers)
- 1.
Which of the following contains the highest percentage of water?
A.A peanut
B.A watermelon
C.A slice of dried beef
D.A piece of cheddar cheese
- 2.
What happens if you consume more fat-soluble vitamins (like A and D) than your body needs?
A.They are immediately washed out in urine
B.They are stored in the body's fat tissues
C.They are turned into carbohydrates
D.They are used to make blood cells
- 3.
Which of these is a symptom of Marasmus, a form of severe malnutrition?
A.Strong muscles
B.Severe weight loss and thinning of tissues
C.Excessive height
D.Bright orange skin
- 4.
Why does a teenager usually need more energy (calories) than an elderly person?
A.They have fewer bones
B.They are generally more active and still growing
C.They have a shorter digestive system
D.They do not need vitamins
- 5.
In the context of nutrition, what does the term 'malnutrition' specifically refer to?
A.Only the condition of being extremely underweight
B.A condition resulting from a diet that lacks certain nutrients or has them in the wrong proportions
C.The process of food being broken down in the stomach
D.A disease caused by eating too much fiber
- 6.
Which nutrient group is the primary component of enzymes and hormones in the body?
A.Carbohydrates
B.Vitamins
C.Proteins
D.Minerals
- 7.
Pellagra is a disease characterized by dermatitis, diarrhea, and dementia. It is caused by a deficiency of:
A.Vitamin B3 (Niacin)
B.Vitamin A
C.Iron
D.Fiber
- 8.
What is 'Hidden Hunger'?
A.Feeling hungry even after eating a large meal.
B.A condition where an individual consumes enough calories but suffers from chronic micronutrient (vitamin/mineral) deficiencies.
C.The hunger experienced by hibernating animals.
D.A psychological disorder where a person forgets they have eaten.
- 9.
Copper deficiency is rare, but it can lead to symptoms similar to iron-deficiency anemia. Why?
A.Copper is used to make red blood cells green instead of red.
B.Copper is a necessary cofactor for the enzymes that transport iron and incorporate it into hemoglobin.
C.Copper is what the body uses to make sugar.
D.Copper deficiency prevents the lungs from taking in nitrogen.
- 10.
An individual has a BMI of 32 but is a professional bodybuilder with very low body fat. Why is BMI potentially misleading in this case?
A.BMI does not take into account the height of the individual.
B.BMI does not distinguish between muscle mass and fat mass, and muscle is denser than fat.
C.Bodybuilders do not need nutrients, so BMI doesn't apply.
D.The BMI scale is only designed for children under age 10.
Download the worksheet for Human Body Systems - Nutrients and Malnutrition to practice offline. It includes additional chapter-level practice questions.
Impact of Lifestyle on Health
SubtopicImpact of Lifestyle on Health under Human Body Systems for Grade 7 IB.
Preview questions (no answers)
- 1.
Which of the following is the most effective way to improve your overall fitness over time?
A.Doing exercise once a month
B.Being consistent with regular physical activity
C.Only exercising when you feel like it
D.Watching sports on television
- 2.
What is the benefit of having a hobby or engaging in social activities for health?
A.It increases physical strength only
B.It supports mental and emotional well-being
C.It helps the body store more sugar
D.It prevents the need for sleep
- 3.
How does maintaining a healthy weight affect the joints in the body?
A.It increases the pressure on the knees
B.It reduces the stress and wear on the joints
C.It makes the joints stiffer
D.It has no effect on bone health
- 4.
Which food is a good source of healthy unsaturated fats?
A.Butter
B.Avocado
C.Fried chicken
D.Candy
- 5.
How does a diet high in 'antioxidants' (like those in berries) benefit the human body at a cellular level?
A.By providing extra mitochondria to every cell.
B.By neutralizing molecules that can damage DNA and cell membranes.
C.By making the cell wall of animal cells much thicker.
D.By allowing cells to survive without any water.
- 6.
Which of the following is a negative impact of air pollution on the circulatory system?
A.Fine particles can enter the bloodstream and cause inflammation in the blood vessels.
B.Pollution causes the blood to turn blue, which carries more oxygen.
C.Smog helps the heart pump blood with less effort.
D.Air pollution has no way of reaching the circulatory system.
- 7.
What happens to the 'resting heart rate' of an individual who moves from a sedentary lifestyle to a very active one over several months?
A.It stays exactly the same because the heart is a muscle that doesn't change.
B.It increases because the heart gets used to beating fast.
C.It decreases because the heart becomes more efficient at pumping blood.
D.It fluctuates randomly because the nervous system becomes confused.
- 8.
Why is a sedentary lifestyle often linked to 'Varicose Veins' (swollen, twisted veins)?
A.The blood in the veins gets too hot and expands.
B.A lack of leg muscle contraction means blood is not efficiently pushed upward against gravity, causing it to pool and stretch the vein walls/valves.
C.Sitting down causes the veins to turn into arteries.
D.The heart pumps blood too fast into the legs when a person is sitting.
- 9.
Considering the impact of sugar on the body, how does a high-sugar lifestyle affect the of the mouth and dental health?
A.Sugar is a base, so it raises the pH and makes teeth stronger.
B.Bacteria in the mouth metabolize the sugar and produce as a byproduct, which dissolves the calcium phosphate in tooth enamel.
C.The sugar coats the teeth and protects them from bacteria like a shield.
D.The sugar turns into a gas that kills all the beneficial bacteria in the throat.
- 10.
A person has a lifestyle of very low water intake (chronic mild dehydration). What is the likely effect on the filtration rate () in the kidneys?
A.The GFR increases to try and find water hidden in the blood.
B.The GFR decreases as the body attempts to conserve fluid, potentially leading to a buildup of metabolic wastes in the blood.
C.The GFR stays exactly the same because the kidneys don't need water to filter.
D.The kidneys stop filtering blood and start filtering air instead.
Download the worksheet for Human Body Systems - Impact of Lifestyle on Health to practice offline. It includes additional chapter-level practice questions.