25. Compare the contraction of a single cardiac muscle fiber to a skeletal muscle fiber in terms of response. That is, which has a graded response and which has an all-or-none response? Cardiac Muscle Fiber Skeletal Muscle Fiber 26. State the relationship between Ca+2 ion concentration in the cytosol of a cardiac contractile cell and the force (strength) of contraction. That is, the greater the concentration of Ca*2 ions in the cytosol, the (greater or lesser?) its force (strength) of contraction.
25. Compare the contraction of a single cardiac muscle fiber to a skeletal muscle fiber in terms of response. That is, which has a graded response and which has an all-or-none response? Cardiac Muscle Fiber Skeletal Muscle Fiber 26. State the relationship between Ca+2 ion concentration in the cytosol of a cardiac contractile cell and the force (strength) of contraction. That is, the greater the concentration of Ca*2 ions in the cytosol, the (greater or lesser?) its force (strength) of contraction.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Can you help with me with questions 25 and 26
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25. Compare the contraction of a single cardiac muscle fiber to a skeletal muscle fiber in terms
of response. That is, which has a graded response and which has an all-or-none response?
Cardiac Muscle Fiber
Skeletal Muscle Fiber
26. State the relationship between Ca*2 ion concentration in the cytosol of a cardiac contractile
cell and the force (strength) of contraction.
That is, the greater the concentration of Ca*2 ions in the cytosol, the
(greater or lesser?) its force (strength) of contraction.
27. State the relationship between stretch in a cardiac contractile cell and its force of
contraction.
That is, the greater the stretch in a cardiac contractile cell the
(greater or lesser?) its force of contraction.
28. Compare the length (time) of an action potential in a skeletal muscle fiber vs cardiac
autorhymic cell vs cardiac contractile cell.
Duration (in milliseconds) of
one action potential
Skeletal Muscle
Fiber
Cardiac
Cardiac
AUTORHYTHMIC Cell CONTRACTILE Cell
29. State the significance of the longer action potential in a cardiac CONTRACTILE cell.
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