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A weak stimulus can cause a muscle fiber to contract only partway?
Wiki User
∙ 11y ago
yes
Wiki User
∙ 11y ago
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What change in an organism's surroundings that will cause the organism to react is called a?
Stimuli are things in the environment that cause change. A reaction to a change in the environment is a reaction to a stimulus.
What does Lower temperatures cause rocks to?
contract
Strong stimuli cause the amplitude of action potentials generated to increase?
Yes. ....Up to a point. There is a threshold the stimulus must surpass before creating a CAP (compound action potential). Anything below this threshold is called subthreshold. Once the stimulus is strong enough cause a CAP it is a stimulus threshold. At this point the CAP will continue to increase as the intensity of the stimulus increases (now termed suprathreshold) until a maximal stimulus causes a maximum response. Any stimulus stronger than the maximal stimulus is called a supramaximal and does not result in any larger a CAP than the maximum response caused by the maximal stimulus. source: http://www.unmc.edu/physiology/Mann/mann12.html
Neuromuscular junction is also known as the what?
The NMJ is the region where the efferent motor nerves connect with muscle tissue. When a signal is sent from the brain, down the spinal cord, to the nerve, neurotransmitters are released into the synaptic cleft (primary acetylcholine), which cause the muscle to contract.
What are functions of synaptic junction?
To "connect" two neurons, (or a neuron and a muscle cell), by providing a space between an axon terminal of one neuron and a dendrite of another neuron (or a muscle cell), so neurotransmitters that are released by an axon terminal can diffuse across that space to reach the dendrite (or muscle cell) and either initiate the possibility of the second neuron to fire or cause a muscle cell to contract.
How does the threshold stimulus influence muscle contraction?
The threshold stimulus is the stimulus required to create an action potential. So any stimulus under this level will not cause muscle contraction, while a stimulus above this level will cause the muscle to contract. The higher the stimulus the more muscle fibers are recruited, and thus the higher the response.
How does the stretch reflex cause the quadriceps femoris muscle group to contract?
Tapping on the patellar tendon stretches receptors called the muscle spindles in the quadriceps muscle group of the anterior thigh. This stimulus evokes a rapid motor reflex to contract the quadriceps and shorten the muscles. This process is called the patellar reflex.
What is the minimal level of stimulus to cause a muscle contraction?
it is known as the threshold stimulus usually seen in tonic contraction
What is the muscle's role in the body?
to contract to cause movement.
How does neuronal firing cause muscle contraction?
When a neuron in a muscle is fired, or triggered, it sends a message to the brain telling the muscle to contract.
Long thin cells in animals that can contract and cause movement?
muscle cells
What is the receptor effector and stimulus?
Stimulus is like the cause of something or the theme. The receptor is what you use fir the stimulus e.g you look at a tv guide ( stimulus) and the receptor is your eyes because you use them to see it. The effector is the muscle used To use the tv guide so this could be your hand
Any tissue made of cells or fibers that contract and expand to cause movement is an?
Muscle.
What Muscle cause contractions of the heart?
the lungs and the legs contract the heart for regular pulse that murmurs
Is shock from an electric outlet enough to cause pain contract your muscle?
Shock from a standard 110 volt electric outlet can cause pain and contract muscles. An electric shock can cause death. It can also cause severe burns.
Do pinched nerves cause bumps on your back?
Yes. A pinched nerve can cause a muscle to contract. The "bump" that can be felt is actually the center of the tightened muscle. Massage may be used to relax the muscle. Relieving the pinched nerve is of course the better answer.
When a single neuron sends a strong enough impulse to a muscle that how many muscle fibers does it cause to contract?
This will depend upon the number of muscle fibers the nerve innervates. However, all fibers innervated by the nerve should contract in response to the neuronal impulse.
