Answer the following statements true (T) or false (F)
1. The epiglottis is a smooth muscle that covers the glottis during swallowing.
2. Valsalva's maneuver involves closing off the glottis (preventing expiration) while contracting the muscles of expiration, causing an increase in intra-abdominal pressure.
3. Smoking diminishes ciliary action and eventually destroys the cilia.
4. Tracheal obstruction is life threatening.
5. The parietal pleura lines the thoracic wall.
1. FALSE
2. TRUE
3. TRUE
4. TRUE
5. TRUE
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The flexor tendons are located ____________________ on the wrist.
Fill in the blank(s) with the appropriate word(s).
To initiate a smooth muscle cell contraction, calcium enters the cell and binds to
A. troponin, which then activates myosin light-chain kinase. B. calmodulin, which then binds to and activates myosin light-chain kinase. C. a myosin head, which then activates calmodulin. D. myosin light-chain kinase, which then hydrolyzes ATP. E. a phosphatase, which then removes the tropomyosin blockade.
The subdural space is the region between the arachnoid mater and the dura mater
Indicate whether this statement is true or false.
Answer the following questions true (T) or false (F)
1. Urine dripping from a renal pyramid passes first into the major calyx then into the minor calyx. 2. The glomerulus is fed and drained by arterioles. 3. The proximal tubule is lined with simple cuboidal epithelium and microvilli.