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Need help with both please #3 and #7

Need help with both please #3 and #7

Human Anatomy & Physiology (11th Edition)
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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Need help with both please #3 and #7
**Question 3** Which of the following creates a muscle contraction? - ○ When the muscle filaments remain stationary and the muscle lengthens. - ○ When a chemical message passes from the muscle fiber into the motor neuron. - ○ When the myofibrils organize into repeating segments called sarcomeres. - ● When muscle filaments slide across each other and the muscle shortens. The correct answer, indicated with a filled circle, is: "When muscle filaments slide across each other and the muscle shortens."
Transcribed Image Text:**Question 3** Which of the following creates a muscle contraction? - ○ When the muscle filaments remain stationary and the muscle lengthens. - ○ When a chemical message passes from the muscle fiber into the motor neuron. - ○ When the myofibrils organize into repeating segments called sarcomeres. - ● When muscle filaments slide across each other and the muscle shortens. The correct answer, indicated with a filled circle, is: "When muscle filaments slide across each other and the muscle shortens."
**Question:** Which of the following describes the relationship between myosin and actin? **Options:** - O When actin binds to protein complex, it shifts and exposes myosin-binding sites. - O When the energy powers of myosin and actin combine, it is called the power stroke. - O When the myosin heads bind to actin, the cross bridges are established. - O Myosin and actin do not interact at all in the muscle contraction process.
Transcribed Image Text:**Question:** Which of the following describes the relationship between myosin and actin? **Options:** - O When actin binds to protein complex, it shifts and exposes myosin-binding sites. - O When the energy powers of myosin and actin combine, it is called the power stroke. - O When the myosin heads bind to actin, the cross bridges are established. - O Myosin and actin do not interact at all in the muscle contraction process.
Expert Solution
Step 1

The muscles has an unique characteristics of contraction and relaxation. In the muscle fibre contractile proteins that are- actin filaments, myosin filaments and several other accessory proteins are involved in this muscle contraction.

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