ACh receptors are found mainly ina. synaptic vesicles.b. terminal cisterns.c. thick filaments.d. thin filaments.e. junctional folds

Veins Label the venous diagrams depicted in Figure 12.3A–B with the following terms from Exercise 12-3. Use your text and Exercise 12-3 in this unit for reference. Note that these diagrams are presented in color to facilitate identification of the vessels. Veins of the Upper Limbs O Ulnar vein O Radial vein O Median cubital vein O Brachial vein O Basilic vein O Cephalic vein O Axillary vein O Subclavian vein Veins of the Trunk O Superior vena cava OInferior vena cava Veins of the Head and Neck O Internal jugular vein O Vertebral vein O Brachiocephalic vein O Hepatic portal vein O Superior mesenteric vein O Inferior mesenteric vein Renal vein O Common iliac vein A Veins of the Lower Limbs O Great saphenous vein O Femoral vein O External iliac vein 12 3 Major veins: (A) of the body; (B) of the abdomen

When an action potential arrives at the neuromuscular junction, acetylcholine is released into the synaptic cleft and binds to receptors in the postsynaptic membrane. Which of the following represents the correct order of the next series of events?   A. An action potential travels down the T tubules, depolarization spreads through the T tubules, Ca2+ is released from the sarcoplasmic reticulum, and myosin binds to actin.   B. Ca2+ is released from the sarcoplasmic reticulum, an action potential travels down the T tubules, depolarization spreads through the T tubules, and myosin binds to actin.   C. An action potential travels down the T tubules, depolarization spreads through the T tubules, Ca2+ is taken up by the sarcoplasmic reticulum, and myosin binds to actin.   D. T tubules are depolarized, Ca2+ is released from the sarcoplasmic reticulum, an action potential is created in the muscle cell, and myosin bonds to actin.   E. An action potential travels…

Which of the following statements is true of the chameleon tongue but not of the human tongue? A. It is a muscular hydrostat. B. Force generation reflects the binding of myosin crossbridges to actin thin filaments. C. The organization of the actin and myosin filaments produces a regular pattern of bands, or striations. D. Gaps or holes in the Z-discs allow supercontraction (shortening beyond the normal limit). E. All of the above statements are true of both the chameleon tongue and the human tongue.

Actin exits in two forms, a globular G form ( the free subunit) and a filamentous Fform( assembled into a filament. true false

In bending in the binding of the myosin head of the free binding site of the actin filament results in the contraction of the muscle

How do we know that there are vesicles filled with neurotransmitters at the neuromuscular junction? Why are they termed ‘quanta’?