If a muscle cell had very short T-tubules, how much tension would the muscle fiber create, relative to a normal muscle fiber? Assume sarcoplasmic reticulum can still react to activity at the neuromuscular junction.a)Less tension would be created.b) No difference in tension creation.c) More tension would be created.d) No tension would be created. **Question:**When ATP is present in the cytoplasm but not calcium ions, myosin heads will be:- ○ Unbound in a low energy state- ○ Bound to actin subunits in a high energy state- ● Unbound in a high energy state- ○ Bound to actin subunits in a low energy state**Correct Answer:**- ● Unbound in a high energy state**Explanation:**In the absence of calcium ions, the binding sites on actin filaments remain covered by regulatory proteins such as tropomyosin. Even though ATP is present, allowing the myosin heads to be in a high energy configuration, they remain unbound to actin because the necessary binding sites are not exposed.

Answered: f a muscle cell had very short…

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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Question

If a muscle cell had very short T-tubules, how much tension would the muscle fiber create, relative to a normal muscle fiber? Assume sarcoplasmic reticulum can still react to activity at the neuromuscular junction.

a)Less tension would be created.

b) No difference in tension creation.

c) More tension would be created.

d) No tension would be created.

**Question:**

When ATP is present in the cytoplasm but not calcium ions, myosin heads will be:

- ○ Unbound in a low energy state
- ○ Bound to actin subunits in a high energy state
- ● Unbound in a high energy state
- ○ Bound to actin subunits in a low energy state

**Correct Answer:**

- ● Unbound in a high energy state

**Explanation:**

In the absence of calcium ions, the binding sites on actin filaments remain covered by regulatory proteins such as tropomyosin. Even though ATP is present, allowing the myosin heads to be in a high energy configuration, they remain unbound to actin because the necessary binding sites are not exposed.

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T tubules or the transverse tubules are the extensions of the cell membrane that penetrate into the muscle cells

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