The stalk connecting the pitutitary to the hypothalamus of the brain is the:
A) frenulum
B) sella turcica
C) infundibulum
D) hypothalamic cervix
Ans: C) infundibulum
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The chemiosmotic mechanism involves the transport of ____________________ ions across the inner membrane of the ____________________
Fill in the blank(s) with correct word
Which of these is most responsible for "light adaptation"-the process by which we only gradually become able to see objects in a brightly lit place after being in the dark?
A. Cone receptors are very hyperpolarized in the dark, and they must be exposed to bright light for awhile before they will depolarize. B. Rhodopsin is quickly inactivated in the presence of bright light so rods become unresponsive, and the higher-acuity cones then become the main detectors of vision. C. Cones and rods are stimulated equally, leading to difficulties in interpreting the sensory inputs to the brain. D. Because rods are more sensitive to light than cones, they gradually become extremely activated in bright light. E. Rhodopsin is not activated by colored light, and the lack of stimulation causes rods to gradually depolarize when we are exposed to bright light.
The distinguishing feature of a cervical vertebra is the
A) costal facet. B) vertebral arch. C) transverse foramina. D) spinous process. E) pedicle.
What is the only adrenal sex hormone that has any biological importance?
a. cortisol b. dehydroepiandrosterone (DHEA) c. estrogen d. androgen e. testosterone