1. Which component of blood helps in clotting?
Answer:
Explanation:
Platelets are responsible for blood clotting, preventing excessive bleeding during injuries.
2. Which chamber of the heart receives oxygenated blood from the lungs?
Answer:
Explanation:
The left atrium receives oxygen-rich blood from the lungs via the pulmonary veins.
3. What is the largest artery in the human body?
Answer:
Explanation:
The aorta is the main and largest artery in the human body, originating from the left ventricle of the heart.
4. Which protein in blood carries oxygen to different parts of the body?
Answer:
Explanation:
Hemoglobin, present in red blood cells, binds to oxygen and transports it to various body tissues.
5. Which part of the human body is called the 'blood bank'?
Answer:
Explanation:
The spleen stores blood and releases it during emergencies, earning it the nickname 'blood bank'.
6. Which type of blood vessel carries blood away from the heart?
Answer:
Explanation:
Arteries carry blood away from the heart to various parts of the body.
7. What percentage of plasma is water?
Answer:
Explanation:
Plasma, the liquid component of blood, is about 90% water.
8. Which blood component is responsible for immune responses?
Answer:
Explanation:
White blood cells play a vital role in the body's immune response, defending against pathogens.
9. Which chamber of the heart pumps oxygenated blood to the body?
Answer:
Explanation:
The left ventricle pumps oxygen-rich blood to the body via the aorta.
10. The 'double circulation' in mammals refers to the separate circulation of blood through:
Answer:
Explanation:
Double circulation means that blood passes through the heart twice: once through the pulmonary circuit (lungs) and once through the systemic circuit (body tissues).
11. The heartbeat is initiated by:
Answer:
Explanation:
The sinoatrial (SA) node, located in the right atrium, initiates the heartbeat and is known as the natural pacemaker.
12. Which blood vessels have the thinnest walls?
Answer:
Explanation:
Capillaries have the thinnest walls, facilitating the exchange of substances with tissues.
13. Which blood protein helps maintain osmotic balance?
Answer:
Explanation:
Albumin helps maintain the osmotic balance of blood by regulating the amount of water in the blood.
14. Which part of the heart prevents the backflow of blood from the ventricles to the atria?
Answer:
Explanation:
The tricuspid valve prevents backflow from the right ventricle to the right atrium.
15. Which type of blood vessel connects arteries and veins?
Answer:
Explanation:
Capillaries connect arterioles (small arteries) and venules (small veins), facilitating the exchange of substances.
16. The ‘universal donor’ blood type is:
Answer:
Explanation:
O- blood type lacks antigens on its red blood cells, making it a universal donor.
17. The heart's sound "lub-dub" is created by the closing of:
Answer:
Explanation:
The "lub" sound is due to the closing of atrioventricular valves, and the "dub" sound is due to the closing of semilunar valves.
18. Blood pressure is highest in:
Answer:
Explanation:
Blood pressure is highest in arteries as they carry blood pumped directly from the heart.
19. Which hormone increases the heartbeat rate?
Answer:
Explanation:
Adrenaline, the "fight or flight" hormone, increases the heartbeat rate in response to stress or danger.
20. Lymph primarily differs from blood in that it lacks:
Answer:
Explanation:
Lymph is similar to blood plasma but lacks red blood cells.