The fibrous tunic of the eye is composed of two parts. What are they?
A. The sclera and the uvea
B. The cornea and the sclera
C. The sclera and the retina
D. The conjunctiva and the sclera
E. The conjunctiva and the cornea
Answer: B
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Atropine is sometimes used to dilate the pupil for an eye examination. Which receptor would atropine block?
A. Alpha 1 adrenergic receptor B. Nicotinic receptor C. Muscarinic receptor D. Alpha 2 adrenergic receptor E. Beta receptor
In one kind of second-messenger system,
a. a small amount of one hormone (second messenger) is required to release another b. a tropic hormone (first messenger) stimulates secretion of another hormone (the second messenger) c. the hormone binds to a specific surface receptor, whereupon the hormone-receptor complex moves into the cell to combine with an intracellular receptor d. releasing hormones (first messenger) from the hypothalamus regulate anterior pituitary hormones (second messengers) e. a hormone (first messenger) binds to surface receptors that activate adenylate cyclase, which then catalyzes cAMP formation
A red blood cell, visualized in a blood smear, appears to stain less intensely in the center of the cell than at the periphery. This light staining central region results from:
a. A centrally located Golgi apparatus b. A greater accumulation of hemoglobin within the center of the cell c. A pale-staining nucleus d. An attenuation of the cytoplasm caused by the biconcave disk shape of the cell e. Lipid droplets
Parasympathetic innervation to the hindgut originates in the S2-S4 spinal cord segments. Parasympathetic neurons travel to the prevertebral plexus via which of the following nerves?
A. Greater splanchnic nerves B. Least splanchnic nerves C. Lesser splanchnic nerves D. Lumbar splanchnic nerves E. Pelvic splanchnic nerves F. Sacral splanchnic nerves