Which type of blood vessels contain valves and what is their function?
What will be an ideal response?
Veins contain valves to prevent blood from flowing backward. This is necessary because the venous vessels are a low-pressure system and the blood must sometimes flow against gravity, particularly in the limbs.
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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.
Answer the following statements true (T) or false (F)
1. About 20% of the blood pumped by the heart enters the kidneys. 2. The medulla is the inner part of the kidney. 3. The cortex is the inner part of the kidney. 4. The pyramids are expansions of the upper end of the ureters. 5. The pyramids are the triangular divisions of the medulla of the kidney.
Peptide hormones are:
A. synthesized by the ribosomes of endocrine cells. B. synthesized in the nucleus of endocrine cells. C. synthesized out of the amino acid tryptophan. D. the least prevalent type of hormone in the body. E. manufactured cooperatively by the mitochondria and smooth endoplasmic reticulum.
The duration of the latency period...
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