Which of the following characteristics do skeletal muscle and smooth muscle have in common?
a. Calcium is bound by the protein calmodulin prior to formation of cross-bridges.
b. Tropomyosin is removed from the myosin-binding site on actin, permitting formation of cross-bridges
c. Sliding of thick and thin filaments relative to one another depends on a rise in cytosolic calcium.
d. Sliding of thick and thin filaments relative to one another results in shortening of the sarcomeres.
e. All of these.
C
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Where are the collateral (prevertebral) ganglia located?
A. Just lateral to the vertebral column B. In the walls of organs to be innervated C. Posterior to the vertebral column D. Near arterial branches of the abdominal aorta E. In the brain
The parasympathetic system differs from the sympathetic system by:
A. exiting the CNS at spinal cord levels B. having a two-neuron motor pathway C. having preganglionic cell bodies located in the CNS D. having short postganglionic axons
In the embryo, parallel ridges named digital rays are visible. Which structures will they become?
A. Ribs and vertebrae B. Leg and forearm C. The ulna and radius D. Fingers and toes E. Tarsals and metatarsals
The term urinary calculus means:
A) kidney stones B) lithotripsy C) urinary bladder crystals D) urinary bladder stones