Most of the calcium that triggers contraction of cardiac muscle comes
A. into the cell through leakage channels in the sarcolemma.
B. into the cell through voltage-gated channels in the sarcolemma.
C. from the sarcoplasmic reticulum of the cell.
D. from the Golgi apparatus of the cell.
C
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Which blood vessel supplies blood to the deep muscles of the neck and shoulder and to the first two costal interspaces?
A) intercostal artery B) costocervical artery C) subscapular artery D) long thoracic artery E) ventral thoracic artery
The esophagus
A. has thin walls of connective tissue. B. produces two enzymes that digest proteins. C. has upper and lower sphincters to regulate movement of food. D. has cartilage in its walls to keep it from collapsing. E. extends from the fauces to the stomach.
An example of a symphysis is the ________.
A. sacroiliac joint B. temporomandibular joint C. costovertebral joint D. elbow joint E. intervertebral joint
Loss of equilibrium and motor coordination would most likely be related to a lesion in which structure?
A. Pons B. Medulla oblongata C. Pituitary gland D. Cerebellum E. Limbic system