Calcium plays a role in ____ because it allows the interaction between the plasma and vesicle membranes: a- Synaptic vesicle re-uptake b- Synaptic vesicle specialization c- Synaptic vesicle information d- Synaptic vesicle fusion with the plasma membrane

The sarcoplasmic reticulum releases ____________________ into the sarcoplasm.    When Ca++ binds to troponin it exposes the _______________________ on the thin filament.   In order for a cross bridge to form ______________________ must bind to the myosin head.

In the structure of a sarcomere, which of the following overlap with the region of the A-band? actin myosin 1-disks • two of the above all of the above

Which of the following does NOT limit normal clot growth to the sight of injury? O A) Removal and dilution of clotting factors O B) Fibrin binding to thrombin O C) Antithrombin III D) Exposed collagen fibers O E) Serotonin

What sort of cellular changes would you expect a sailor sick with scurvy to experience? O Their collagen (an extracellular matrix component) would be diminished, resulting in fewer binding sites for integrins. The end result would be less adherent cells. O Their collagen (a cytoskeletal fiber) would be diminished, resulting in a loss of contractile motion within the cell, affecting both cell migration and muscle function.

If a skeletal muscle has depleted its stores of ATP how will the altered transport properties of the following transporters affect cytosolic ion concentrations (increase, decrease, no change) relative to normal?   Skeletal Muscle Cell With Depleted ATP Stores Ion transporter Cytosolic K+ Cytosolic Na+ Cytosolic Ca2+ NKA         NCX         SERCA

Which two cytoskeletal components are most intimately associated with muscle movement? O Actin and plectin O Actin and beta-tubulin O Keratin and myosin O Actin and myosin O Keratin and dystrophin

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…

Actin filaments are composed of?

In muscle, calcium moves from the cytoplasm to the sarcoplasmic reticulum by O active transport, ion channels using diffusion, pumps O diffusion, ion channels active transport, pumps