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What is the first step toward generating a skeletal muscle contraction?
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The first step toward generating a skeletal muscle contraction is The first step toward generating a skeletal muscle contraction is?
stimulation of the muscle by a nerve ending.
The first step toward generating a skeletal muscle contraction?
stimulation of the muscle by a nerve ending.
During muscle contraction the moves toward the?
the insertion moves toward the origin
What causes lymph to move toward the heart?
The lymph is circulated via muscle movement. The lymphatic system is not closed and has no central pump; thus transport is slow and sporadic. Lymph movement occurs due to peristalsis (propulsion of the lymph due to alternate contraction and relaxation of smooth muscle), valves, and compression during contraction of adjacent skeletal muscle and arterial pulsation.
1 Describe the ionic events underlying the nerve action potential 2. Describe the steps in cross bridge cycle that produces skeletal muscle contraction.?
thick filaments pulling thin filaments toward the center of the sarcomere
What is the protein filament that slides inward toward the middle of a sarcomere during a muscle contraction?
Actin
What are the skeletal muscle interactions?
Skeletal muscles work together or in opposition Muscles only pull (never push) As muscles shorten, the insertion generally moves toward the origin Whatever a muscle (or group of muscles) does, another muscle (or group) "undoes"
Five golden rules of gross skeletal muscle activity?
1. All muscles cross at least one joint. 2. Typically, the bulk of muscle lies proximal to the joint crossed. 3. During contraction, the muscle insertion moves toward the origin. 4. All muscles have at least two attachments (origin and insertion). 5. Muscles always pull, they never push.
Which Muscle movement in myosin heads of the thick filaments pull on the thin filaments causing the thin filaments to slide toward the center of the sarcomere?
Flexing of the cross bridge (power stroke)
What spasmodic is a stiff neck due to contraction of the neck muscles that pull the head toward the affected side?
Also known as a wry neck, spasmodic torticollis is a stiff neck due to spasmodic contraction of the neck muscle. The spasm causes the head to be pulled toward the affected side.
What is the change in appperence of a myofibril during contraction with the I band?
In skeletal muscle contraction, the thin filaments of the sarcomere slide toward the M line, in between the thick filaments. This is called the sliding filament theory. The width of the A zone stays the same, but the Z lines move closer together. As the sarcomeres shorten and appear closer together, the muscle pulls together, producing tension that moves whatever it is attached to.Contraction is an active process; relaxation and return to resting length is entirely passive.
What is a muscle tissue made of?
Muscle tissue has a ability to relax and contrastand so bring about movement and mechanical work in various parts of the body. There are other movements in the body too which are necessary for the survival of the organism such as the heart beat and the movements of the alimentary canal
