Select the best answer or answers from the choices given: The function of the T tubules in muscle contraction is to (a) make and store glycogen, (b) release Ca2+ into the cell interior and then pick it up again, (c) transmit the action potential deep into the muscle cells, (d) form proteins

Skeletal muscle contraction is influenced by A) frequency of stimulation B) calcium release from the sarcoplasmic reticulum C) dihydropyridine receptors D) ryanodine receptors E) all of the above

Please answer all of this following questions in your own words, thank you.  Q1: Which muscles form the quadriceps? How do they function together? Q2: studied the steps of skeletal muscle contraction (sliding filament mechanism). Briefly outline the steps of the sliding filament model of muscle contraction. just mention what is happening with each of the "filaments." Q3: What would be the effect on the muscle if acetylcholinesterase was not present? (8)

Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 23. A. skeletal muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. B. smooth muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require an extracellular inward-Calcium-current to stimulate the An burst of Calcium from intracellular stored-Calcium-organelles. D. No type of muscle cell requires an extracellular inward-Calcium current for normal contractile-function.

A motor unit is the smallest voluntary functional unit of force production and consists of one motor neuron and all the muscle fibers that it innervates. a.) True   b.) False

What is the role of calcium in muscle contractions? Multiple Choice   a) To spread the action potential through the T-tubules   b) To bind with troponin, changing its shape so that binding sites on the actin filament are exposed   c) To transmit the action potential across the neuromuscular junction   d) To re-establish the polarization of the plasma's membrane following an action potential   e) To break the cross-bridges as a cofactor in the hydrolysis of ATP

In skeletal muscle, the sarcolemma is directly covered by: a) epimysium. b) perimysium. c) endomysium.

Pick the right order for muscle contraction a) ATP attaches to myosin, muscle cell uses calcium, action potential spreads b) Calcium release, binding sites on actin are exposedmyosin binds to actin c) Myosin binds to actin, myosin uses calcium, cell gets shorter d) Action potential is received , cell gets shorter, myosin grabs actin

Smooth muscle has actin/myosin, why is it not striated? (consider what striation can provided)

Please answer both questions.  At some point, increasing stimulus strength will not result in a larger contraction strength. a) true  b) false  Like nerves, muscles must fully return to their initial position before they can be stimulated again. a) true  b) false