Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The Circulatory System consists of the heart, blood vessels, and blood, responsible for transporting , , nutrients, and waste products.
Blood is composed of Plasma (liquid part) and three types of cells: Red Blood Cells (), White Blood Cells (), and Platelets.
contain a red pigment called Hemoglobin, which binds with oxygen to form Oxyhemoglobin for transport.
The human heart is a four-chambered muscular organ with two upper chambers called Atria and two lower chambers called Ventricles.
Arteries carry oxygenated blood () away from the heart to the body, with the exception of the Pulmonary Artery.
Veins carry deoxygenated blood () from the body back to the heart, with the exception of the Pulmonary Vein.
Capillaries are extremely thin-walled vessels where the actual exchange of gases ( and ) and nutrients takes place.
Double Circulation involves two circuits: Pulmonary circulation (heart to lungs and back) and Systemic circulation (heart to body and back).
📐Formulae
💡Examples
Problem 1:
A person's heart beats times in minutes. Calculate the heart rate in beats per minute ().
Solution:
Explanation:
Heart rate is defined as the number of heartbeats per unit of time (usually 1 minute). By dividing the total beats by the total minutes, we find the rate is .
Problem 2:
Explain the role of Hemoglobin in the transport of .
Solution:
Explanation:
Hemoglobin () is a protein in that has a high affinity for oxygen. In the lungs, it combines with oxygen to form a temporary compound called Oxyhemoglobin, which travels through the blood to reach tissues.
Problem 3:
Differentiate between the pressure in Arteries and Veins.
Solution:
Explanation:
Blood in arteries is pumped directly by the heart, resulting in high pressure (). Therefore, arteries have thick, elastic walls. Veins carry blood under lower pressure back to the heart and contain valves to prevent backflow.