Table 1 Statements in test instrument

1- During physical activity, oxygen enters the skeletal muscle tissue from the blood because:

a) Oxygen content inside muscle tissue decreases as the oxygen is used

b) Muscle require oxygen to produce energy

2- During exercise, heart rate increases:

a) Due to the need for oxygen-rich blood for active tissues

b) Due to vagal withdraw and progressive stimulation of sympathetic activity

3- The gas exchange in the lungs occurs:

a) Due to the pressure gradient of oxygen and carbon dioxide between the alveoli and blood capillaries

b) Due to the need to supply oxygen to the tissues and eliminate carbon dioxide on exhalation

4- Increased oxygen transport in the blood occurs:

a) Due to the need for oxygen supply to produce ATP and assist in muscle contraction

b) Due to the increase in bonds between oxygen and hemoglobin, which is essential for the functioning of tissues

5- During exercise, blood pressure does not decrease because:

a) Muscle afferences send information to the central nervous system, which inhibits the action of baroreflex and modulates autonomic nervous activity

b) There is an increase in heart rate and blood flow to match delivery of oxygen and nutrients of the contracting skeletal muscles metabolic demand

6- The respiratory cycle is regulated by:

a) The need to adapt the respiratory rate to the metabolic demand

b) Inherent activity of medullary neurons and peripheral chemoreceptors

7- During exercise, the increase in pulmonary ventilation is regulated by:

a) Interactions between cortical and peripheral feedback that stimulate respiratory neurons in the medullary respiratory neurons

b) Increase in tidal volume and respiratory rate to match the metabolic demand of the active muscle of oxygen input and carbon dioxide output

8- During exercise, blood flow is regulated:

a) To redistribute oxygen-rich blood to active muscles and match metabolic demand

b) By the interaction between sympathetic nerve activity, vasoconstriction, peripheral receptors and local mechanisms of vasodilatation

9- Sweating occurs whenever:

a) The body needs to eliminate excess heat

b) The muscle surround the sweat glands contract