Question

QUESTION 2 Chickens occasionally use their breasts for flying extremely short distances, usually to escape perceived danger. Chickens generally use their legs for support while standing, and for walking. Chicken breasts are composed of “white meat” while chicken legs are composed of “dark meat”. Which of the following is true?

Group of answer choices

A) Chicken breasts are composed mostly of slow oxidative fibers; chicken legs are composed mostly of fast anaerobic fibers

B) Chicken breasts are composed mostly of slow oxidative fibers and fast aerobic fibers; chicken legs are composed mostly of fast anaerobic fibers.

C) Both chicken breasts and legs are composed of slow oxidative fibers; and the color is determined by the total myoglobin content in each muscle

D) Both chicken breast and legs are composed primarily of fast aerobic fibers and the color is determined by how many blood vessels there are in the particular muscle

E) Chicken breast are composed mostly of fast anaerobic fibers; chicken legs are composed mostly of slow oxidative and fast aerobic fibers.

QUESTION 3) While the semilunar valves are open during a normal cardiac cycle, the pressure in the left ventricle is ___ Group of answer choices

A) None of the choices are correct

B) greater than the pressure in the aorta

C) less than the pressure in the aorta

D) less than the pressure in the left atrium

E) the same as the pressure in the left atrium

Answer 1

Question 2.

Option E stands CORRECT.

Chicken breast are composed mostly of fast anaerobic fibers; chicken legs are composed of mostly of slow oxidative and fast aerobic fibers.

Chicken breast muscles are used for flying extremely short distances, usually to escape perceived danger. So these muscles are composed of fast twitch fibers and they derive energy mostly from anaerobic glycolysis, hence they are called fast anaerobic fibers and constitutes white meat, whereas chicken legs are used for standing and walking, so these muscles are composed of slow twitch fibers and they derive energy by means of aerobic glycolysis as they are used for slow and steady movements. So, they are composed of slow oxidative and fast aerobic fibers which constitutes dark meat.

Question 3.

Option B stands CORRECT.

While the semilunar valves open during a normal cardiac cycle especially the aortic valve, the oxygenated blood enters from the left ventricle to aorta. So, initially in the rapid ejection phase of cardiac cycle, there will be an increase in the pressure of left ventricle greater than the aorta during ventricular systole. But soon, due to peripheral resistance exhibited by aorta in the reduced ejection of ventricular systole, the aortic pressure exceeds left ventricular pressure rssulting in the closure of aortic valve to prevent backflow of blood into left ventricle.