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Acetylcholine is the neurotransmitter released by the nervous system that excites muscle cells, leading to muscle contraction.
When the nervous system signals a muscle to contract, calcium channels open in the muscle cell membrane. Calcium ions then flow into the muscle cell, triggering a series of biochemical events that eventually lead to muscle contraction.
Cardiac muscle. Unlike skeletal and smooth muscle, the contraction of cardiac muscle is involuntary and requires stimulation from the nervous system. This ensures that the contractions of the heart are synchronized and coordinated.
The main cation affecting electrical stimulation of the heart is calcium (Ca2+). Calcium plays a crucial role in the initiation and propagation of action potentials in cardiac muscle cells, leading to contraction and the pumping of blood throughout the body.
Enhance cellular communication passage for nervous stimulation during muscle contraction.
is actively pumped into the extracellular fluid for storage.
is actively pumped into the extracellular fluid for storage.
calcium is actively pumped into the extracellular fluid for storage until the next contraction
Smooth & cardiac muscle.
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Acetylcholine is the neurotransmitter released by the nervous system that excites muscle cells, leading to muscle contraction.
When the nervous system signals a muscle to contract, calcium channels open in the muscle cell membrane. Calcium ions then flow into the muscle cell, triggering a series of biochemical events that eventually lead to muscle contraction.
Cardiac muscle. Unlike skeletal and smooth muscle, the contraction of cardiac muscle is involuntary and requires stimulation from the nervous system. This ensures that the contractions of the heart are synchronized and coordinated.
The main cation affecting electrical stimulation of the heart is calcium (Ca2+). Calcium plays a crucial role in the initiation and propagation of action potentials in cardiac muscle cells, leading to contraction and the pumping of blood throughout the body.
Enhance cellular communication passage for nervous stimulation during muscle contraction.
Yes, nerve stimulation is necessary for skeletal muscles to contract. This stimulation causes an action potential to travel down the motor neuron, leading to the release of acetylcholine at the neuromuscular junction, which triggers muscle contraction by causing calcium release in the muscle fiber. Without this nerve input, skeletal muscles would not be able to contract voluntarily.
No, cardiac muscle fibers do not require outside nervous stimulation to contract. They have an inherent ability to generate action potentials due to specialized pacemaker cells, primarily located in the sinoatrial (SA) node. This intrinsic property allows the heart to beat rhythmically and autonomously, although the autonomic nervous system can modulate the heart rate and contraction strength.