While on a peaceful morning walk, you pass a construction site where a person suddenly starts using a jackhammer. Unconsciously, you turn your head from the noise. This action is due to the response of which structure(s)?
A. The middle cerebellar peduncles
B. The thalamus
C. The inferior colliculi
D. The superior colliculi
E. The substantia nigra
C. The inferior colliculi
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Explain why animals are used in research. Are there any limitations to the application of animal data to human physiology? Could these limitations be addressed using cell or tissue culture, or computer simulations?
What will be an ideal response?
Consider the following events in the nuclear receptor model:
(1) Hormone receptor complex binds to DNA. (2) Messenger RNA directs synthesis of specific proteins. (3) Hormone binds to receptors in the nucleus (sometimes in the cytoplasm) (4) Messenger RNA synthesis is activated. (5) Synthesized proteins produce the response of the cell. Which of these events occurs in the nucleus? A. 1, 3, 5 B. 1, 3, 4 C. 1, 2, 3 D. 3, 4, 5 E. All events occur in the nucleus.
The conjunctiva is composed of ________ epithelium.
A. stratified keratinized B. simple cuboidal C. simple columnar D. simple squamous E. stratified squamous
Case study:You have just admitted Mary Roberts, a 70-year-old woman, to the hospital for GI bleeding. Her blood pressure is 130/80, pulse 80/min and irregular, respirations 18/min, and temperature 99.2. Mrs. Roberts denies pain at this time, although she appears anxious and very pale. Her medical history includes lung cancer that was diagnosed two weeks ago, peptic ulcer disease with reflux esophagitis, and "fluid retention." Admission lab work shows a plasma Na+ of 152 mEq/L and K+ of 2.8 mEq/L.The K+ level of 2.8 mEq/L indicates hypokalemia. Low plasma K+ levels will cause ________.
A. muscle weakness B. paralysis C. thirst D. tremors, tetany, and convulsions E. increased body temperature