A premature baby born at 27 weeks gestation is suffering from respiratory distress syndrome. What is the probable cause?
A. The foramen ovale failed to close at birth.
B. Fluid in the lungs was not adequately reabsorbed by the blood and lymphatic capillaries.
C. The alveoli are not adequately developed by 27 weeks.
D. The breath was not vigorous enough to pop open the alveoli.
E. There is not enough surfactant to keep the alveoli from collapsing.
E. There is not enough surfactant to keep the alveoli from collapsing.
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The neural arch is formed by the
A. two pedicles and two laminae. B. two pedicles, two laminae, and body. C. two pedicles and body. D. two laminae and body.
If more energy is contained in the food eaten than is expended, then
a. a positive energy balance will exist b. the excess energy will be stored in adipose c. all of the excess energy will be liberated d. a and b are true e. a and c are true
The primary target cells for GnRH are located in the
A. anterior pituitary gland. B. hypothalamus. C. genitals. D. adrenal gland. E. gonads.
What event(s) could cause presynaptic inhibition?
A. Removal of SNARE complexes B. A second neuron causes a reduction in neurotransmitter release from another neuron C. Inactivation of Ca2+ channels D. All of the choices are correct.