when a muscle is unable to respond to stimuli temporarily

The correct answer: When a muscle is unable to respond to stimuli temporarily, it is during B) refractory period. The refractory period of the muscle is the specific time required for the muscle to get back to the relaxed state.

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What is it called when a muscle responds to a stimulus?

A twitch occurs when one muscle fiber contracts in response to a command (stimulus) by the nervous system. The time between the activation of a motor neuron until the muscle contraction occurs is called the lag phase (sometimes called the latent phase).

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What is the time following a stimulus during which a muscle cell is unable to respond to another stimulus called?

By definition, the refractory period is a period of time during which a cell is incapable of repeating an action potential. In terms of action potentials, it refers to the amount of time it takes for an excitable membrane to be ready to respond to a second stimulus once it returns to a resting state.

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What happens in muscles when nervous stimulation stops?

Muscle Fibers Relax When the Nervous System Signal Is No Longer Present. When the stimulation of the motor neuron providing the impulse to the muscle fibers stops, the chemical reaction that causes the rearrangement of the muscle fibers’ proteins is stopped.

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What is it called when a muscle is unable to contract?

Complete muscle function loss, or paralysis, involves being unable to contract your muscles normally.

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What is a muscle stimulus called?

A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles. Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron.

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What is the ability to receive and respond stimulus called?

The ability of an organism to respond to external stimuli is called sensitivity. For example, Plants grow towards light(external stimuli) sources, and if the direction of light is changed, the plant will also change its direction of growth to accommodate for survival. So, the correct answer is ‘Sensitivity’.

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What happens when muscle stimulation ceases?

Relaxation: Relaxation occurs when stimulation of the nerve stops. Calcium is then pumped back into the sarcoplasmic reticulum breaking the link between actin and myosin. Actin and myosin return to their unbound state causing the muscle to relax.

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Can muscle contract without nervous stimulation?

Some muscles (skeletal muscles) will not contract unless stimulated by neurons; other muscles (smooth & cardiac) will contract without nervous stimulation but their contraction can be influenced by the nervous system. Thus, the nervous and muscle systems are closely interconnected.

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What happens to calcium after nervous stimulation of muscle has ceased?

Answer and Explanation: The correct answer is option C because calcium levels in the cytoplasm drop after nervous stimulation cessation as the calcium is pumped back into the sarcoplasmic reticulum using ATP as energy.

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Can skeletal muscle function without nervous stimulation?

Unlike cardiac muscle, skeletal muscle has no intrinsic spontaneous activity because it lacks the ion channels responsible for spontaneous membrane depolarization. Therefore, the stimulus for physiological skeletal muscle activity is always derived from a nerve impulse.

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What is it called when a muscle responds to a stimulus?

A twitch occurs when one muscle fiber contracts in response to a command (stimulus) by the nervous system. The time between the activation of a motor neuron until the muscle contraction occurs is called the lag phase (sometimes called the latent phase).

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What is refractory period of muscle?

In physiology, a refractory period is a period of time during which an organ or cell is incapable of repeating a particular action, or (more precisely) the amount of time it takes for an excitable membrane to be ready for a second stimulus once it returns to its resting state following an excitation.

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What is the latency period in muscles?

The latent period is a short delay (1-2 msec) from the time when the action potential reaches the muscle until tension can be observed in the muscle.

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What is the stimulus for muscle contraction?

A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles. Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron.

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What causes muscles to not contract?

Muscle rigidity is often triggered by stress. Stress can adversely affect your body’s nervous system — including your nerves — and how they function. Your nervous system may respond to stress by putting additional pressure on the blood vessels, which results in reduced blood flow to the muscles.

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What happens when a muscle stops contracting?

Muscle contraction usually stops when signaling from the motor neuron ends, which repolarizes the sarcolemma and T-tubules, and closes the calcium channels in the SR. Ca++ ions are then pumped back into the SR, which causes the tropomyosin to re-cover the binding sites on actin (Figure 10.3. 2).

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What is the opposite of contracting your muscles?

Muscle contraction is often followed by muscle relaxation, when contracted muscles return to their normal state.

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What is it called when a muscle contracts?

A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. In contrast, a muscle contraction is isotonic if muscle tension remains the same throughout the contraction.

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