Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The Muscular System is made up of over muscles that allow the body to move, maintain posture, and circulate blood.
Muscles work by contracting (shortening) and relaxing (lengthening). They usually work in pairs called antagonistic pairs.
There are three main types of muscle tissue: Skeletal (voluntary movement), Smooth (involuntary movement in organs), and Cardiac (the heart).
Voluntary muscles are those you choose to move, like your , while involuntary muscles work automatically, like your for breathing.
Muscles require energy to function, which is often provided by a molecule called (Adenosine Triphosphate).
Tendons are strong cords of tissue that connect skeletal muscles to bones, allowing the pull of a muscle to move a limb.
📐Formulae
💡Examples
Problem 1:
Explain how the arm bends at the elbow using the concept of muscle pairs.
Solution:
When you bend your arm, the muscle contracts while the muscle relaxes.
Explanation:
Muscles can only pull, not push. Therefore, to move a bone back and forth, they must work in pairs where one muscle shortens () to pull the bone, and the other returns to its original length ().
Problem 2:
Why does your body temperature rise when you exercise your muscles?
Solution:
During exercise, muscles convert chemical energy into movement and heat: .
Explanation:
As muscles work harder, the chemical reactions inside the cells increase, releasing thermal energy as a byproduct, which increases the body's temperature.
Problem 3:
Classify the heart muscle and explain if it is voluntary or involuntary.
Solution:
The heart is made of muscle and it is an muscle.
Explanation:
You do not have to consciously think to make your heart beat; the nervous system and the heart's own pacemaker control it automatically .