Need help with both please #3 and #7

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?
O When the muscle filaments remain stationary and the muscle lengthens.
O When a chemical message passes from the muscle fiber into the motor neuron
O When the myofibrils organize into repeating segments called sarcomeres.
When muscle filaments slide across each other and the muscle shortens.
Transcribed Image Text:Question 3 Which of the following creates a muscle contraction? O When the muscle filaments remain stationary and the muscle lengthens. O When a chemical message passes from the muscle fiber into the motor neuron O When the myofibrils organize into repeating segments called sarcomeres. When muscle filaments slide across each other and the muscle shortens.
Which of the following describes the relationship between myosin and actin?
O When actin binds to protein complex, it shifts and exposes myosin-binding sites
O When the energy powers of myosin and actin combine, t 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:Which of the following describes the relationship between myosin and actin? O When actin binds to protein complex, it shifts and exposes myosin-binding sites O When the energy powers of myosin and actin combine, t 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
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