Action potential ente from adjacent cell. 1 Ca2+ 2 K* 3 Na* Ca2+ ЕCF ATP NCX ICF 3 Na* RyR Ca2+ Sarcoplasmic reticulum (SR) SR L-type Ca2+ Ca2+ channel Ca2+ stores ATP T-tubule Ca2+ sparks Ca2+ signal Ca2+ Ca2+ Actin eleeee Relaxation Myosin Contraction Copyright © 2009 Pearson Education, Inc. 1. Explain what is going on in steps 1-6. 2. Explain what transport proteins are involved is getting Ca2+ out of the cytosol. 3) Purple foxglove is a plant containing chemicals that slow the activity of the Ca2+-Na+ antiport. What will ingestion of purpl foxglove increase or decrease levels of Na+ in the ICF?

Action potential ente from adjacent cell. 1 Ca2+ 2 K* 3 Na* Ca2+ ЕCF ATP NCX ICF 3 Na* RyR Ca2+ Sarcoplasmic reticulum (SR) SR L-type Ca2+ Ca2+ channel Ca2+ stores ATP T-tubule Ca2+ sparks Ca2+ signal Ca2+ Ca2+ Actin eleeee Relaxation Myosin Contraction Copyright © 2009 Pearson Education, Inc. 1. Explain what is going on in steps 1-6. 2. Explain what transport proteins are involved is getting Ca2+ out of the cytosol. 3) Purple foxglove is a plant containing chemicals that slow the activity of the Ca2+-Na+ antiport. What will ingestion of purpl foxglove increase or decrease levels of Na+ in the ICF?

Anatomy & Physiology

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter10: Muscle Tissue

Section: Chapter Questions

Problem 1ILQ: Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and...

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Subject: Neurophysiology Would a skeletal muscle fire an AP if a single quanta of ACh was secreted? Why or why not?
Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?
Watch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the junction points between sarcomeres? (b) What are the names of the subunits within the myofibrils that run the length of skeletal muscle fibers? (c) What is the â€œdouble strand of pearlsâ€� described in the video? (d) What gives a skeletal muscle fiber its striated appearance?
Cardiac muscles differ from skeletal muscles in that they ________. are striated utilize aerobic metabolism contain myofibrils contain intercalated discs
Actin exits in two forms, a globular G form ( the free subunit) and a filamentous Fform( assembled into a filament. true false
While the sarcoplasmic reticulum of muscle was first described by nineteenth-century microscopists, its true significance was not ap-preciated until its intricate structure was revealed much later by the electron microscope. What could you tell a nineteenth-century microscopist to enlighten him or her about the structure of the sarcoplasmic reticulum and its role in the coupling of excitation and contraction?
Atrophy refers to ________.a. loss of elasticityb. loss of massc. loss of rigidityd. loss of permeability
Narrate the action potential from start to finish. Be sure to include and define the following terms: threshold, rising phase, falling phase, refractory period, exocytosis.
Please ASAP. Thank you What is the effect of membrane potentials on the movement of ions across a cell? use the following Nernst potential values:Sodium=+67mV; Potassium=-98mV; Calcium=+129mV; and chloride=-90mV
What does the sodium-potassium pump do to reset and maintain resting potential? Inwhat sense is this an active transport mechanism?
Following the arrival of an action potential in stimulated cells, synaptic vesicles rapidly fuse with the presynaptic membrane. This happens in less than l ms. What mechanisms allow this process to take place at such great speed?
Order the following events of excitation and excitationcontraction coupling. Put 1 by the first event, 2 by the second, and so on._____ The motor end plate generates an end-plate potential._____ The action potential spreads along the T-tubules, SR calcium ion channels are pulled open, and calcium ions flood the cytosol._____ Acetylcholine binds to receptors on the motor end plate, and ligand-gated ion channels open._____ Calcium ions bind troponin, which allows tropomyosin to move away from the actin active site, initiating a contraction cycle._____ The action potential propagates through the sarcolemma and dives deeply into the cell along the T-tubules.