What is the function of the filaments found in ranges 1/2 and 6 7 but no other ranges?
What is the function of the filaments found in ranges 1-2 and 6-7 but no other ranges? Elastic (titin) filaments help to protect the muscle from overstretching and also aid in returning it to normal length. This enzyme breaks down acetylcholine into acetic acid and choline.
What initiates an action potential on a muscle cell?
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.
Which protein and ion initiates muscle coupling?
What specific neurotransmitter is released from the axonal terminus as shown in A?
What result would be expected if an additional stimulus?
What result would be expected if an additional stimulus, equal in intensity to the first, were to be applied to the muscle at the 60 millisecond (ms) time point? The muscle would increase in tension to a level greater than that measured at the beginning of phase C.
What is the most distinguishing characteristic of muscle tissue?
Ch 9 practice exam muscles and muscle tissuesQuestionAnswerwhat is true about isotonic contraction?Muscle tension remains relatively constant.What is the most distinguishing characteristic of muscle tissue?Its ability to transform chemical energy into mechanical energy.Ещё 90 строк
What are the 5 steps of an action potential?
Phases. The course of the action potential can be divided into five parts: the rising phase, the peak phase, the falling phase, the undershoot phase, and the refractory period. During the rising phase the membrane potential depolarizes (becomes more positive).
What stimulates an action potential?
When depolarization reaches the threshold potential, it triggers an action potential. … In the generation of the action potential, stimulation of the cell by neurotransmitters or by sensory receptor cells partially opens channel-shaped protein molecules in the membrane.
What are the 4 steps of an action potential?
Summary. An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of four phases; hypopolarization, depolarization, overshoot, and repolarization. An action potential propagates along the cell membrane of an axon until it reaches the terminal button.
What is the process of excitation?
Excitation, in physics, the addition of a discrete amount of energy (called excitation energy) to a system—such as an atomic nucleus, an atom, or a molecule—that results in its alteration, ordinarily from the condition of lowest energy (ground state) to one of higher energy (excited state).
What are the 6 steps of muscle contraction?
Terms in this set (6)
- Ca2+ release from SR terminal Cisterinae binding site exposure.
- Myosin head binding to actin binding sites.
- Release of ADP & Pi Causes power stoke.
- ATP causes Myosin head to be released.
- ATP is hydrolyzed, re-energizes the Myosin head.
- Ca2+ pumped back into SR terminal cisterine.
Why is calcium needed 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).
What are the steps of neurotransmitter release?
Neurotransmitter release from the presynaptic terminal consists of a series of intricate steps: 1) depolarization of the terminal membrane, 2) activation of voltage-gated Ca2+ channels, 3) Ca2+ entry, 4) a change in the conformation of docking proteins, 5) fusion of the vesicle to the plasma membrane, with subsequent …
How does calcium cause neurotransmitter release?
There the calcium ions interact with the neurotransmitter containing vesicles (membrane-bound containers) causing them to fuse with the cell membrane, and release the neurotransmitters into the synaptic cleft.