Which center stimulates inspiration by increasing the activity of the dorsal respiratory group (DRG)?
A. Respiratory center
B. Pneumotaxic center
C. Pulmonary center
D. Apneustic center
Answer: D
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True or False? Cytotoxic T cells can respond only to cells that display abnormal MHC Class II molecules.
Answer the following statement true (T) or false (F)
Keratin and collagen are considered ________ proteins.
A. structural B. fibrous C. functional D. Both structural and fibrous are correct.
All of the following are true of the fibrous layer of the eye except that it
A) consists of the sclera, limbus, and cornea. B) provides mechanical support and some protection for the eye. C) produces aqueous humor. D) contributes substantial focusing power. E) is where extrinsic eye muscles insert.
Why is the contraction strength of smooth muscle relatively independent of its resting length?
A. It is involuntary muscle. B. It gets nearly all of its Ca2+ from the extracellular fluid. C. It does not have intercalated discs. D. It is regulated by a length-tension relationship. E. It does not have sarcomeres.