Question

1) Which of the following statements is true regarding the human circulatory system?

A) If we were to stretch them out we would have about 50 miles worth of blood vessels.

B)The type of blood vessels that carry blood away from the heart are called veins.

C) Blood pumped out of the heart carries delivers oxygen and nutrition to all the body tissues and organs except the liver.

D) The left side of the heart always contains freshly oxygenated blood.

2) All of the following are true regarding cardiorespiratory function, EXCEPT:

A) The birth place of red blood cells is in bone marrow.

B) Before we can make red blood cells iron from diet must be delivered to the bones.

C) The efficiency of oxygen uptake at the lungs happens thanks to balloon- like structures called alveoli.

D) The cells of the alveolar wall are surrounded by capillaries which enable oxygen to get close enough to red blood cells to be sweeped up by the process of diffusion.

E) The creation of red blood cells is managed by the liver using a hormone called erythropoietin.

3) All of the following are true regarding the cardiovascular system, EXCEPT:

A) Both fit and unfit people’s hearts must pump about 5 liters of blood through the cardiovascular system each minute.

B) At rest, a fit person’s heart pumps more times than an unfit persons heart because the heart is stronger and can push more blood per stroke.

C) At rest, a fit person’s heart pumps fewer times than an unfit persons heart because the heart is stronger and can push more blood per stroke.

D)The heart rate during rest or exercise can be influenced by the amount of resistance the blood encounters in blood vessels.

4) All of the following is true regarding the ACSM position stand under hotlink 7, EXCEPT:

A) The guidelines contained within it are derived from decades of scholarly (peer-reviewed) research on the relationship of exercise and health.

B) It emphasizes the importance of avoiding prolonged periods of sitting.

C) It states that if we don't meet the guidelines we will not reap any health benefit.

D) It suggests the importance of neuromotor exercise involving balance, agility, and coordination.

Answer 1

1. The total length of blood vessels is 60,000.

Arteries carry blood away from heart.

Oxygenated blood is also delivered to the liver.

The left side of the heart gets oxygenated blood directly from the lungs. The blood comes into atrium then through ventricles goes into the circulation.

The answer is 'd'.

2. Red cells are formed in bone marrow.

Iron is required for Hb formation, so iron needs to be transported to bone.

Alveoli have key role in exchange of gases.

Erythropoietin is released mainly by kidneys.

The answer is 'E'

3. The cardiac output is stroke volume multiplied by heart beats per minute i.e 70ml×70= 4900ml. This is the amount of blood pumped by heart per minute.

A fit person's heart beats more effectively, so his/her heart beat per minute is less than an unfit person. The unfit person's heart compensate it's inefficiency by increasing the heart beats.

The answer is 'B'.