During the cardiac cycle,
A. all four chambers of the heart are in systole at the same time.
B. the right atrium and the right ventricle contract simultaneously.
C. the left atrium contracts before the right atrium.
D. the two atria relax while the two ventricles contract.
E. all four chambers of the heart contract at the same time.
Answer: D
You might also like to view...
Delayed action genes can result in fatal diseases
Indicate whether the statement is true or false
A(n) ________ contains a renal pyramid, the overlying area of the renal cortex and the adjacent renal columns.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not part of the mature sperm cell?
a. acrosome b. midpiece c. tail d. all of the above are part of the mature sperm cell
Which of the following is not true of the hormone TSH?
A. Due to negative feedback, a low level of thyroid hormones will inhibit the release of TSH. B. It is synthesized by the anterior pituitary gland. C. It stimulates the release of thyroid hormones. D. Its target is the thyroid gland. E. All of these are true of the hormone TSH.