Question

What is the response of a muscle fiber to an increase in the firing rate of...

  1. What is the response of a muscle fiber to an increase in the firing rate of a neuron at the neuromuscular junction? How does the nervous system increase the force of contraction in a muscle composed of many motor units?
Science   Anatomy-And-Physiology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Increase firing rate of a neuron at the neuromuscular junction results in temporal summation.

Temporal summation occurs when a high frequency of action potentials in the presynaptic neuron elicits postsynaptic potentials that summate with each other.

Temporal summation makes the motor units firing increase their increase the rate of firing resulting in increased force of contraction. When the frequency of stimulation becomes great enough, the muscle will not have time to relax completely before the next contraction begins. At this point the degree of contraction will increase due to temporal summation.

Force of a muscle composed of many motor units is increased by increasing the stimulation of many motor units resulting in contraction of more motor fibers.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Somatic Nervous System Concept Map using the terms below. Neuromuscular Junction Spinal Cord Ventral Horn Somatic...
Somatic Nervous System Concept Map using the terms below. Neuromuscular Junction Spinal Cord Ventral Horn Somatic Motor Neuron Axon Terminal Skeletal Muscle Fiber Motor Unit Synaptic vesicles Acetylcholine Motor end Plate Nicotinic receptors Ligand Gated Na/K channels Acetylcholinesterase End Plate Potential Muscle Action Potential
What neurotransmitter does a somatic motor neuron release into the synapse with a skeletal muscle fiber?...
What neurotransmitter does a somatic motor neuron release into the synapse with a skeletal muscle fiber? What is the effect on the membrane potential of the muscle fiber? How is ACh removed from the synapse?
When a motor neuron triggers a muscle fiber to contract, _________ion is released from the __________________________________....
When a motor neuron triggers a muscle fiber to contract, _________ion is released from the __________________________________. This ion binds to the ________________, which pushes the tropomyosin aside, exposing the ___________________________on the actin filaments.   If ____________is present, it will bind to a myosin head and release energy, causing a change in shape (the high-energy configuration). This myosin head then forms a ___________________with the actin filament.   ___________and __________ are released, and the myosin head returns to its normal shape (_________________________), which makes...
20200--PHYS- lab --Skeletal Muscle 1) What is the function of the sarcoplasmic reticulum? ______________________________________ ___________________________________________________________________________________ 2)...
20200--PHYS- lab --Skeletal Muscle 1) What is the function of the sarcoplasmic reticulum? ______________________________________ ___________________________________________________________________________________ 2) Describe the function of troponin and tropomyosin _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ 3) Why will overstretching a skeletal muscle result in less contractile force?________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 4) Which phase of skeletal muscle contraction is the most brief?________________________________ 5) Which type of skeletal muscle fiber is the most prevalent in everyone? ________________________ 6) Increasing voltage to a muscle will increase contraction force up to a limit-why? __________________...
There is a disease that in the nervous system, it shows up as a reduced firing...
There is a disease that in the nervous system, it shows up as a reduced firing rate in the neurons. What ion or channels could cause this and how? In the skeletal muscle, the strength of contraction is drastically reduced What ion or protein might be responsible? In the cardiac muscle, we witness a tendency toward tetanus. The muscle isn’t relaxing sufficiently between contractions. What ion or protein might be responsible?
1. Why might a muscle cell fail to show any EPSPs? 2. What is the main...
1. Why might a muscle cell fail to show any EPSPs? 2. What is the main factor that determines the time course of the falling phase of the EPSP? 3. What is the pathway and the mechanism by which a sensory stimulus can change the EPSP frequency in the muscle? What would be the effect of this change in frequency on muscle contraction? That is, how is it that EPSPs are summating, and in this muscle, what are the functional...
1.) Single muscle cells have an electrical all or none response similar to action potentials of...
1.) Single muscle cells have an electrical all or none response similar to action potentials of neurons. True False 2.) Acetylcholine released from a motor neuron onto a skeletal muscle cell is an example of __________ signaling. endocrine exocrine autocrine paracrine 3.) Multiple, closely spaced depolarizations of skeletal muscle can sum together to produce a more powerful contraction because of accumulation of __________. ATP in the cytosol ATP in the sarcoplasmic reticulum Ca2+ in the sarcoplasmic reticulum Ca2+ in the...
a) What would be the effect on the spinal stretch reflex of a specific muscle if...
a) What would be the effect on the spinal stretch reflex of a specific muscle if the gamma efferents to that muscle were stimulated to fire at a higher rate than they had been initially? Briefly explain. b) I ask you to generate force continuously with a muscle innervated by two motor units, a small one and a large one. I ask you to increase force gradually (starting from generating ZERO force), then maintain exerting a lot of force, then...
Human Anatomy & Physiology-Assignment 4 Chapter 11 A muscle fiber is ________. A) a muscle cell...
Human Anatomy & Physiology-Assignment 4 Chapter 11 A muscle fiber is ________. A) a muscle cell B) a rod-like structure consisting of sarcomeres placed end to end C) an arrangement of actin and myosin filaments deep within a muscle cell D) the elaborate arrangement of smooth endoplasmic reticulum inside a muscle cell What is the correct order of structures as you move from outside a muscle cell, to deep inside it? A) myofibril, myofilament, fiber B) myofilament, fiber, myofibril C)...
What two mechanisms can be combined to regulate the strength of a muscle contraction? A.The intensity...
What two mechanisms can be combined to regulate the strength of a muscle contraction? A.The intensity of the action potential and variable inhibition of Ca2+ release. B. The type of muscle fiber activated and the number of neurons activating each fiber C. Action potential frequency and selective recruitment of motor units D. Spindle fiber activation and neural myelination
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT