True or False 1. When a normal, healthy individual does large muscle, dynamic, s

Question

True or False

1. When a normal, healthy individual does large muscle, dynamic, steady-state exercise, typically venous PCO2 decreases (compared to the resting value).

True

False

2. The redistribution of blood away from metabolically less active tissues and toward more active tissues during exercise (compared with rest) helps to maintain mean arterial blood pressure and contributes to a lower oxygen content of mixed venous blood.

True

False

3. One of the most important physiological adaptations that result in an increased VO2max in healthy individuals in response to endurance exercise training is increased blood hemoglobin concentration.

True

False

4. If end-diastolic volume is unchanged, an increase in left ventricular contractility would result in an increase in stroke volume.

True

False

5. Hemoglobin plays important roles in transporting both oxygen and carbon dioxide in the blood.

True

False

6. When arterial blood pressure increases, the rate of myocardial energy requirement tends to decrease.

True

False

Explanation / Answer

Question 1)

Answer : false

Reason : large muscle steady state exercise involved aerobic mechanisms predominating. as such oxygen is consumed and carbon dioxide is excreted . as such the pco2 increases fro the normal .

Question 2)

Answer : True

Reason :active tissues have significant vasodilation which leads to reduced total peripheral resistence. with more of the cardiac output being diverrted to the active tissues this leads to maintenance of the MAP via this process the metabolically active tissues consume higher amounts of oxygen and as sch has a output of carbon dioxide. this increases carbon dioxide partial pressures while reducing that of oxygen.

Question 3)

Answer : False

Reason : endurance exercise in a healthy individual lead to increase in exercise capacity mainly by changes in the stroke volume. the stokevolume increases leading to better efficieny of heart function and better cardiac fitness. the blood volume does increase but not haemoglobin specifically.

Question 4)

Answer : False

Reason : stroke volume is mainly determined by the end diastolic volume.. the end diastolic volume determines the stretch of the vantricle which determines the stroke volume. contractility is dependent on the end diastolic volume changing.. as such if the end diastolic volume remains the same the contractility will remain constant.

Question 5)

Answer : true

Reason : haemoglobin is involved in transporting the major portion of oxygen while also transporting a small amount of carbon dioxide as carboxyhaemoglobin.

Question 6)

Answer : false

Reason : blood pressure is determined by stroke volume and total peripheral resistance. stroke volume is proportionate to end diastolic volume. so an increase in stroke volume in high blood pressure leads to increased preload. where as an increase in total peripheral resistance leads to increased afterload. as such high blood pressure increases the amount of work to be done by the heart. increasing the energy requirement.

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