Which hormones counteract each other in regulating calcium homeostasis?
A. antidiuretic hormone and aldosterone
B. atrial natriuretic peptide and aldosterone
C. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D)
D. antidiuretic hormone and parathyroid hormone
E. antidiuretic hormone and vitamin D (1,25 dihydroxyvitamin D)
C. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D)
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Which of the following blood vessels play an important role in controlling blood flow to different regions of the body through the contraction and relaxation of smooth muscles in their walls?
A. arterioles B. arteries C. veins D. venules E. capillaries
The thick filament is composed almost entirely of _____ molecules.
A. actin B. myosin C. troponin D. tropomyosin E. thrombin
Which group would be considered a community?
a. fish, birds, alligators, water b. a group of alligators c. polar bears, seals, fish d. pandas, bamboo and mountains e. a group of seaweed
Steroids ____
a. have no fatty-acid component b. consist of three rings c. have the same type of functional groups attached to them d. are a specialized type of wax e. are a specialized type of phospholipid