Question

30. Which is correct about the contraction sequence of the heart?

A.Contraction begins in the order: right atrium, then right ventricle, then left atrium, then left ventricle.

B.The right atrium and ventricle contract at the same time, and as they are relaxing, the left atrium and left ventricle begin to contract.

C.The contraction and relaxation of all four chambers happen at the same time.

D.The two atria contract at the same time, and as they are relaxing, the two ventricles contract together.

32. Insulin is secreted to lower excess blood glucose level after a meal. Insulin is the

A. Effector

B. Stimulus

C. Integration center

D. Response

35. Which of the following is true regarding hormone concentrations prior to ovulation beginning?

A. Estrogen levels drop

B. Progesterone levels are high

C. Follicle Stimulating hormone remains constant

D. Lutein hormone levels spike

Answer 1

30..option D.The two atria contract at the same time, and as they are relaxing, the two ventricles contract together.

Explanation:' Its explained by cardiac cycle the two atria, contract simultaneously when they relax   the ventricles, contract.

31. D. Response

Insulin is response ,The pancreas functions as an integrating center and effector as It secretes insulin.

32. D. Lutein hormone levels spike

Lutein hormone levels spike secretion surges to really high levels as it triggers ovulation about 24 to 36 hours later.