Easy
What prevents blood from flowing backward in the heart?
Answer: Valves (tricuspid, bicuspid/mitral, and semilunar valves).
Does O blood type has marker molecules?
Yes or No
NO
Why is the circulatory system vital for survival?
Answer: It transports oxygen, nutrients, hormones, and removes waste, ensuring all body cells function properly.
Type-O can receive blood from anyone.
True or False
False
you are lucky
you get 3 bounce mark
2. What is the function of red blood cells?
Answer: To carry oxygen from the lungs to tissues and transport carbon dioxide back to the lungs.
Which part of the heart is known as the “pacemaker”?
A) AV node
B) SA node
C) Bundle of His
D) Purkinje fibers
B) SA node
Why would a giraffe need much higher blood pressure than a human?
Answer: A giraffe’s heart must pump blood against gravity up its long neck to reach the brain. To overcome this height difference, it generates nearly twice the blood pressure of humans, preventing fainting due to lack of oxygen in the brain.
What is the name of the fluid portion of blood?
A) Serum
B) Plasma
C) Hemoglobin
D) Lymph
B) Plasma
If a person’s left coronary artery becomes blocked, what effects would this have on the circulatory system and why might it be fatal?
Answer: The left coronary artery supplies oxygen to the left side of the heart, including the left ventricle. A blockage reduces oxygen delivery, weakening contractions and causing myocardial infarction. Since the left ventricle pumps blood to the entire body, failure can rapidly lead to death.