Which of the following antagonistic hormones keep the blood calcium level balanced?
A. Parathyroid hormone and calcitonin
B. FSH and LH
C. Epinephrine and norepinephrine
D. Aldosterone and cortisol
E. ADH and OT
Answer: A
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A hypotonic solution
A) has a lower concentration (number) of solute particles than do the cells in the solution. B) causes cells to shrink. C) has a higher osmotic pressure than do the cells in the solution. D) would cause cells in the solution to lose water.
Which of the four curves of the adult vertebral column develop as an infant begins to lift its head?
A) pelvic B) thoracic C) cervical D) lumbar
When a few intracellular mediator molecules activate several enzymes, and each of these activated enzymes activate still other enzymes, the hormone has initiated
A. a cascade effect. B. a double loop effect. C. a protein kinase effect. D. a cyclic effect. E. a negative feedback cycle.
Muscle tissue that is involuntary:
A) cardiac muscle only B) smooth muscle only C) skeletal muscle only D) cardiac muscle and smooth muscle E) cardiac muscle and skeletal muscle