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What is the first phase after a stimulus in a muscle contraction?
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∙ 11y ago
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∙ 11y ago
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Why is it only possible to induce an extrasystole during relaxation?
The cardiac muscle is incapable of reacting to any stimulus before approximately in the middle of phase 3. It will not react to a normal cardiac stimulus before phase 4.
The terms systole and diastole refer respectively to the?
contraction phase and relaxation phase of the ventricles
The R wave of the ECG is most closely associated with which phase of the cardiac contraction cycle?
Ventricular contraction.
What is the deep muscle of the thorax that promote the inspiratory phase of breathing?
The diaphragm is the primary muscle responsible for the inspiratory phase of breathing in the thorax. It contracts and moves downward, increasing the volume of the thoracic cavity and allowing air to enter the lungs. This action helps in the intake of oxygen during inhalation.
What role does the biceps muscle play in downward phase of close grip barbell press?
The close grip barbell press is an exercise that works out your Tricep muscle exclusively. Your bicep muscles do not play any part in the downward phase of this exercise.
What are the three stages of muscle cell contraction?
The three stages of muscle cell contraction are excitation, excitation-contraction coupling, and contraction. During excitation, an action potential triggers the release of calcium ions from the sarcoplasmic reticulum. In excitation-contraction coupling, calcium binds to troponin, allowing for cross-bridge formation between actin and myosin. Finally, in the contraction stage, myosin heads pull on actin filaments, causing muscle contraction.
What phase is between stimulus of a muscle and the shortening of the muscle?
The phase between the stimulus of a muscle and the shortening of the muscle is called the latent phase or latent period. During this phase, the muscle is receiving the signal to contract, but actual muscle shortening has not yet occurred. This period is important for the muscle fibers to prepare and generate enough force for contraction.
What is the contraction phase?
The contraction phase refers to the stage of a muscle action where the muscle fibers shorten and generate force. This is when the muscle is actively contracting and pulling on the tendons to create movement.
What is second stimulus before relaxation causes increased force called?
Contraction phase
What muscle contraction occurs in the biceps brachii during the upward phase of the bicep curl?
a concentric contraction- a concentric contraction involves the muscle length, shortening during a contraction! YA-trick-YA!
What is a concentric contraction?
concentric contraction is atype of muscle contraction which the muscle shortens while genrating aforce The muscle shortens to produce movement. A muscle contraction in which shortening occurs.
What is an example of an isotonic contraction?
An Isotonic contraction is when a muscle becomes longer or shorter to produce force and therefore an example is a bicep curl. During the downward phase your muscle (bicep) lengthens and during the upward phase your muscle (bicep) shortens.
What is the premotor phase of reaction time?
The premotor phase of reaction time involves perceiving a stimulus and preparing a response. During this phase, the brain processes information from the environment and plans the motor action required to respond to the stimulus. This phase occurs before the actual execution of the motor response.
Why is it only possible to induce an extrasystole during relaxation?
The cardiac muscle is incapable of reacting to any stimulus before approximately in the middle of phase 3. It will not react to a normal cardiac stimulus before phase 4.
Why is it only possible to induce an extrasystole during relaxation period?
The cardiac muscle is incapable of reacting to any stimulus before approximately in the middle of phase 3. It will not react to a normal cardiac stimulus before phase 4.
What kind of muscle contraction occurs in the rectums femoris during the lowering phase of a wall squat?
isometric
What result would be expected if an additional stimulus equal in intensity to the first were applied to the muscle at the 60 millisecond time point?
the muscle would increase in tension to a level greater than that measured at the beginning of phase C.
