What Causes Excitation-contraction Coupling? Excitation-contraction coupling involves the transformation of depolarizing events in the sarcolemma into the initiation of mechanical shortening of the myofibrils within the myofiber by calcium ions released from the terminal cisternae of the sarcoplasmic reticulum (SR). What is the relationship between the number of motor neurons recruited and the number of
What Type Of Process Conducts Nerve Impulses Toward The Cell Body? A typical neuron has a cell body containing a nucleus, one or more branching filaments called dendrites which conduct nerve impulses towards the cell body and one long fibre, an axon, that carries the impulses away from it. What conducts nerve impulses toward the
Why Is Nerve Impulse Conduction An All Or None Response? The all-or-none law is a principle that states that the strength of a response of a nerve cell or muscle fiber is not dependent upon the strength of the stimulus. If a stimulus is above a certain threshold, a nerve or muscle fiber will fire.
Why Do Action Potentials Travel Faster In Myelinated Axons? Action potential propagation in myelinated neurons is faster than in unmyelinated neurons because of saltatory conduction. Why do impulses travel faster in myelinated axons? Myelin can greatly increase the speed of electrical impulses in neurons because it insulates the axon and assembles voltage-gated sodium channel clusters
What Is Impulse In Nervous System? The nerve impulse is an electrical phenomenon that passes as a wave along the surface membrane of a nerve fiber. Normally the nerve cell is at resting potential, based on the concentration of sodium and potassium ions inside and outside of the cell. What is nerve impulse in simple
How Are Signals Between Neurons Transmitted? Communication among neurons typically occurs across microscopic gaps called synaptic clefts. … A neuron sending a signal (i.e., a presynaptic neuron) releases a chemical called a neurotransmitter, which binds to a receptor on the surface of the receiving (i.e., postsynaptic) neuron. How do two neurons communicate across the space
Where Does The Impulse Start In The Nerve? Nerve impulses begin in a dendrite, move toward the cell body, and then move down the axon. A nerve impulse travels along the neuron in the form of electrical and chemical signals. The axon tip ends at a synapse. Where does the nerve impulse formally begin? It
When A Stimulus Is Converted Into An Electrical Signal It Is Called? Although the sensory systems associated with these senses are very different, all share a common function: to convert a stimulus (light, sound, or the position of the body) into an electrical signal in the nervous system. This process is called sensory transduction. What
What Makes Nerve Impulses Travel Faster? The axon is covered with a myelin sheath, a fatty layer that insulates the axon and allows the electrical signal to travel much more quickly. The node of Ranvier is any gap within the myelin sheath exposing the axon, and it allows even faster transmission of a signal. Does
How Impulses Are Transmitted In A Reflex Arc To Prevent A Person From Injuring Themselves? How impulses are transmitted in a reflex arc to prevent a person from injuring themselves? Reflex arcs Receptor in the skin detects a stimulus (the change in temperature). Sensory neuron sends electrical impulses to a relay neuron, which is located