A condition in which there is lack of a regular rhythm of the heartbeat is:

[Answer to ques. #1]  C
Explanation: A) A murmur is an abnormal blowing sound heard when auscultating the heart.
B) Palpitation is an abnormal throbbing or fluttering of the heart felt by the patient.
C) Correct.
D) Fibrillation is a condition in which the heart quivers with a disorganized rhythm.

[Answer to ques. #2]  B
Explanation: A) The pineal gland does not directly regulate many other endocrine glands.
B) Correct. The pituitary is the master gland because it directly regulates so many other endocrine glands.
C) The hypothalamus does not directly regulate many other endocrine glands.
D) The gonads do not directly regulate many other endocrine glands.

[Answer to ques. #3]  B
Explanation: A) Veins return blood to the heart.
B) Correct.
C) Capillaries are the smallest vessels between the arteries and veins.
D) The atria are the upper chambers of the heart.

[Answer to ques. #4]  C
Explanation: A) The pituitary gland is located at the base of the brain.
B) The pituitary gland is attached to the hypothalamus by the infundibulum stalk.
C) Correct. The pituitary is located at the base of the brain just below the hypothalamus.
D) The hypothalamus is located in the lower central part of the brain.

[Answer to ques. #5]  C
Explanation: A) Pulse pressure is the difference between the systolic and diastolic readings.
B) An artery transports blood away from the heart to all body parts.
C) Correct. Blood pressure exerts pressure on the artery walls.
D) A capillary is a microscopic blood vessel with single-celled walls that connect arterioles with venules.

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