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What is the minimal impulse that can initiate a muscle contraction?
Wiki User
∙ 9y ago
Threshold stimulus
The minimal level of stimulation required to cause a fiber to contract is called the THRESHOLD STILULUS.
Wiki User
∙ 9y ago
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What does not act as a stimulus to initiate a muscle contraction?
a change of temperature.
Where are the cells that initiate the stimulus for contraction of the heart muscle located?
SA node
What monitors muscle length and sends an impulse to the spinal cord to initiate the stretch reflex?
What monitors muscle length and sends an impulse to the spinal cord to indicate the stretch reflex
The impulse that triggers a contraction travels deep into a muscle fiber by means of what?
transverse tubules
What is the minimal stimulus needed to elicit a muscle contraction is called?
Threshold Stimulation
What is the minimal intensity of stimulation necessary to trigger a muscle contraction?
threshold stimulus
What is the minimal strengh of stimulation needed to elicit a muscle fiber contraction called?
Threshold
What is the minimal level of stimulus to cause a muscle contraction?
it is known as the threshold stimulus usually seen in tonic contraction
Does the impulse cross the neuromuscular junction when a muscle contracts?
No, the impulse traveling down the axon ends at the axon terminal but causes the axon terminal to release neurotransmitters. The neurotransmitters diffuse across the synaptic cleft causing the sarcolemma of the muscle to initiate its own impulse.
The minimal strength of stimulation needed to elicit a muscle contraction is called the threshold stimulus?
true
What do not act as a stimulus to initiate a muscle contraction a. hormonal activity b. neurotransmitters c. a change in the pH of a muscle d. a change of temperature?
d.
Where in the heart do electric impulses begin?
In a normal heart, the electrical impulse resulting in depolarization and contraction of the cardiac muscle originates in the sinoatrial (SA) node and propagates through the atria to the atrioventricular (AV) node before moving on to the ventricles. When the electrical impulse for muscle contraction is generated, it travels throughout the muscle of each atrium, causing atrial contraction. the impulse then travels to the atrioventricular (AV) node. according to Medical Assisting- administrative and clinical procedures with anatomy and physiology.
