Which statement accurately describes the effects of oxytocin and prostaglandins on uterine contractions?
A. Both oxytocin and prostaglandins inhibit uterine contraction.
B. Both oxytocin and prostaglandins stimulate uterine contraction.
C. Prostaglandins stimulate uterine contractions, but oxytocin inhibits them.
D. Oxytocin stimulates uterine contractions, but prostaglandins inhibit them.
Answer: B
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Answer the following statement(s) true (T) or false (F)
1. Excitable cells respond to outside stimuli by means of changes in plasma membrane shape. 2. Smooth and cardiac muscles are under involuntary control. 3. Dendrites in a neuron send outgoing signals to other cells. 4. The duct of an endocrine gland leads into the bloodstream rather than onto an epithelial surface. 5. Scar tissue helps to hold an organ together but does not restore normal function of the damaged tissue.
Which part of the brain stem has centers for the control of breathing, heart rate, and vasoconstriction?
A. Pons B. Medulla oblongata C. Midbrain D. Hypothalamus
Sound travels directly to the eardrum through the
A) pinna. B) external auditory canal. C) cochlea. D) vestibule. E) ear ossicles.
Calcium plays an essential role in all of the following except ________
A) DNA synthesis B) exocytosis C) blood clotting D) muscle contraction E) communication among neurons