Question

13-1/Which of the following receptors are stimulated most by lactic acid in the blood?

Select one: _

a. Pulmonary receptors _

b. Central chemoreceptors

C. Peripheral chemoreceptors

d. Lung stretch receptors

2/Which process in the cycle of skeletal muscle contraction is called the power stroke?

Select one:

a. Rotation of myosin heads to pull actin filaments inward _

b. Separation of myosin from actin 7

c. Hydrolysis of ATP at the myosin heads _

d. Formation of cross bridges between myosin and actin

3/The correct formula for estimating the ejection fraction is to divide the stroke volume by:

Select one: _

a. after load

b. cardiac output

c. end diastolic volume

d. end systolic volume

4/Baby suckling on the mothers nipple stimulates secretion of:

Select one:

_ a. estrogen and progesterone _

b. oxytocin and prolactin

_ c. oxytocin and progesterone

_ d. prolactin and estrogen

Answer 1

Specifically the addition of the lactic acid to the blood of an individual by exercise or some other means will lowers the pH of the blood and will causes hyperventilation almost entirely by stimulating the peripheral chemoreceptors of the individual . This will cause a decrease in the ph as well as increase the respiratory rate in the individual to reduce the acidic level in blood

So option c is the correct answer

Option a,b are wrong as central and pulmonary receptors most commonly do not respond to lactic acid increase in the extremities and in blood

Option d is wrong as lung stretch receptors will not ever cause an increase in respiration due to lactic acid increase