Membranes are called selectively permeable because they allow most substances to enter the cell
a. true
b. false
Ans: b. false
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Bob was completely bald on the top of his head by the time he was 35 years of age. Bob noticed he produced abundant sweat on his head when he exercised. He also noticed that his scalp was no longer oily. Which of the following changes account for the observations? (1) He has fewer functional hair follicles now.(2) He has fewer functional sebaceous glands now.(3) He has fewer merocrine sweat glands now.(4) He has fewer apocrine sweat glands now.
A. 1, 2, 3 B. 1, 2, 4 C. 1, 3, 4 D. 1, 2 E. 1, 2, 3, 4
After passing from the thoracic cavity over the border of the first rib, the subclavian artery changes its name. The name changes continue along the arm and to the hand. In correct order, these names are:
(1) superficial palmar arch (2) deep palmar arch (3) brachial artery (4) radial artery (5) axillary artery (6) ulnar artery A) 5, 3, 4 or 6, 1 or 2 B) 6, 5, 4, 3, 2, 1 C) 1, 2, 3, 4, 5, 6 D) 1 or 4, 2, 3 or 5, 6 E) None of the answers are correct.
What hormone is made by the parafollicular cells of the thyroid gland?
A) thyroxine (T4 ) B) calcitonin C) triiodothyronine (T3 ) D) parathyroid hormone (PTH)
The pituitary hormone that stimulates milk production by the mammary glands is
A) TSH. B) ACTH. C) GH. D) FSH. E) PRL