Which type of descending motor pathway originates in the brainstem and governs automatic movements that help regulate muscle tone, posture and balance?
a) Indirect pathway
b) Direct pathway
c) Reflex arc
d) Somatic arc
e) Muscle spindles
a
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On axial CT images of the neck, the structure immediately posterior to the trachea is the ____________________.
Fill in the blank(s) with the appropriate word(s).
What is the function of the transverse tubules in a skeletal muscle fiber?
A. They allow action potentials to propagate deep into the center of skeletal muscle cells. B. They run in parallel with the myofibrils, and have abundant Ca2+-ATPase proteins for pumping Ca2+ back into the sarcoplasmic reticulum. C. They manufacture and store ATP. D. They form the Z lines that mark the end of each sarcomere. E. They store the calcium ions that are the main source of activation for the cross-bridge cycle.
The area of a myofibril where there are no actin filaments is the
A) H band. B) M line. C) I band. D) Z line. E) A band
There are special lymphatic vessels called ____ that absorb fats and transport them from the digestive tract to the blood
a. capillaries b. lacteals c. chyle d. arterioles