Lymphatic capillaries owe their permeability to the presence of:
A. an open end that siphons fluid from the interstitial fluid.
B. minivalves in their walls.
C. tight junctions between adjacent cells.
D. proteins in the lymph fluid.
Answer: B. minivalves in their walls.
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There are three codons that do not code for any amino acid.
Answer the following statement true (T) or false (F)
Excess circulating quantities of which of the following nutrient molecules can ultimately be stored in adipose tissue as triglycerides?
a. fatty acids b. glucose c. amino acids d. Both a and b e. All of the above
Which are possible functions of skeletal muscles?a: Maintenance of postureb: Both highly coordinated and localized simple movementsc: Temperature regulationd: Support of certain body organse: Regulation of the movement of material through certain body tracts
A. a, b, c, d B. a, b, e C. a, b, c, d, e D. a, b, c E. a, b, c, e
The contraceptive method in which the penis is removed from the vagina just before ejaculation is called
A. abstinence. B. rhythm method. C. coitus interruptus. D. douching. E. vaginal removal.