How does the sympathetic nervous system decrease glomerular filtration rate?
A) stimulates relaxation of the mesangial cells
B) stimulates constriction of both the afferent and efferent arterioles
C) stimulates constriction of the efferent arteriole only
D) stimulates constriction of the afferent arteriole only
E) stimulates contraction of mesangial cells
Ans: B) stimulates constriction of both the afferent and efferent arterioles
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In the final step of enzymatic catalysis,
A. the product is completed and the enzyme is inactivated. B. equilibrium is obtained so that the enzyme does not catalyze further reactions. C. the substrate is released and the enzyme is inactivated. D. the enzyme and substrate form chemical bonds with each other resulting in a new product. E. the products are released and the enzyme is free to bind other substrates.
The primary source of blood supply to the visual centers in the cerebrum is the internal carotid artery.
a. true b. false
Which cranial nerves have a negative chronotropic effect on heart rate?
A) vagus nerves (CN X) B) trochlear nerves (CN IV) C) glossopharyngeal nerves (CN IX) D) hypoglossal nerves (CN XII)
This figure shows the humerus. What is the feature indicated by number 6?
A. Trochlea B. Capitulum C. Medial condyle D. Lateral condyle E. Head