What causes the receptors on the motor end plate to open quizlet?
The binding of the neurotransmitter to receptors on the motor end plate causes which of the following to occur? Binding of the neurotransmitter causes chemically gated sodium channels to open in the motor end plate. (Yes, sodium enters the cell and causes depolarization.
What causes motor end plate potential?
The electric potential, measured in millivolts (mV), produced by depolarization of the end plate at a neuromuscular junction in response to stimulation by the motor neuron.
What stops a muscle from continuing to contract after it receives a signal to contract?
Muscle contraction usually stops when signaling from the motor neuron ends, which repolarizes the sarcolemma and T-tubules, and closes the voltage-gated calcium channels in the SR. Ca++ ions are then pumped back into the SR, which causes the tropomyosin to reshield (or re-cover) the binding sites on the actin strands.
What is tropomyosin held in place by?
In relaxed muscle, tropomyosin blocks actin–myosin interaction and is held in place by TnT, which binds tropomyosin, TnC, which binds calcium, and TnI, which inhibits the interaction of actin and myosin.
When acetylcholine binds to receptors at the motor end plate the Sarcolemma becomes group of answer choices?
|How would the loss of acetylcholinesterase from the motor end plate affect skeletal muscle?||it would cause muscles to stay contracted|
|When acetylcholine binds to receptors at the motor end plate, the sarcolemma becomes ________________.||more permeable to sodium ions|
What happens when acetylcholine is removed from muscle cells?
Action potential propagation in a skeletal muscle fiber ceases when acetylcholine is removed from the synaptic cleft. … When the action potential reaches the end of the axon terminal, voltage-gated sodium channels open and sodium ions diffuse into the terminal.
Which ion channel is located at the motor end plate and what activates it?
Acetylcholine is a neurotransmitter contained in the vesicles of the pre-synaptic neuron. It is released into the synaptic cleft and activates nicotinic acetylcholine receptors on the motor end plate, and causes local motor end plate depolarization, also known as the end plate potential (EPP).
What are the steps of muscle contraction?
What are the 8 steps of muscle contraction?
- action potential to muscle.
- ACETYLCHOLINE released from neuron.
- acetylcholine binds to muscle cell membrane.
- sodium diffuse into muscle, action potential started.
- calcium ions bond to actin.
- myosin attaches to actin, cross-bridges form.
Why is calcium important for muscle contraction?
Nerve and Muscle Function
Calcium’s positive molecule is important to the transmission of nerve impulses to the muscle fiber via its neurotransmitter triggering release at the junction between the nerves (2,6). Inside the muscle, calcium facilitates the interaction between actin and myosin during contractions (2,6).