Mrs Peterkin
physioex 9.0
Purpose
Does the duration of the latent period change with different stimulus voltage?
What is the role of acetylcholine in a skeletal muscle contraction?
Hypothesis
I predict that the latent period will not change if the stimulant is increased or decreased.
Materials
Human Anatomy &Physiology Marieb/Hoehn
PhysioEx™ Lab: Skeletal Muscle Physiology
Results/Ananlysis
EXERCISE 2
Skeletal Muscle Physiology
Name Valerie Jordan_
Lab Time/Date ___
Activity 1 The Muscle Twitch and the Latent Period
1. Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period ____
_skeletal muscle twitch- the mechanical response to a single action potential___
__skeletal muscle fiber-Skeletal muscle cells that are composed of hundreds to thousands of individual cells that produce muscle tension. These fibers are what move our bodies
And generate muscle tension__
_motor unit- consist of motor neuron and all the muscle fibers___
_latent period- the period of time that elapses between the generation of an action potential in a muscle cell and the start of muscle contraction___
Electrical stimulus- delivers the desired amount and duration of stimulating voltage to the muscles via electrodes resting on the muscle.
2. What .is the role of acetylcholine in a skeletal muscle contraction?
ACH is released at the end-plate potential. ACH diffuses into the sarcolemma, attaches to the receptors in the motor end plate and causes a change in the ions permeability that creates graded depolarization of the end-plate potential. Basically, it attaches to the receptors in the motor-end plate and creates the beginning process of triggering muscle contractions. 3. Describe .the process of excitation-contraction coupling in skeletal muscle fibers.The motor unit meets at the neuromusclular junction, where the axon terminal of a neuron and muscle fiber’s plasma membrane meet, also called the motor
Purpose
Does the duration of the latent period change with different stimulus voltage?
What is the role of acetylcholine in a skeletal muscle contraction?
Hypothesis
I predict that the latent period will not change if the stimulant is increased or decreased.
Materials
Human Anatomy &Physiology Marieb/Hoehn
PhysioEx™ Lab: Skeletal Muscle Physiology
Results/Ananlysis
EXERCISE 2
Skeletal Muscle Physiology
Name Valerie Jordan_
Lab Time/Date ___
Activity 1 The Muscle Twitch and the Latent Period
1. Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period ____
_skeletal muscle twitch- the mechanical response to a single action potential___
__skeletal muscle fiber-Skeletal muscle cells that are composed of hundreds to thousands of individual cells that produce muscle tension. These fibers are what move our bodies
And generate muscle tension__
_motor unit- consist of motor neuron and all the muscle fibers___
_latent period- the period of time that elapses between the generation of an action potential in a muscle cell and the start of muscle contraction___
Electrical stimulus- delivers the desired amount and duration of stimulating voltage to the muscles via electrodes resting on the muscle.
2. What .is the role of acetylcholine in a skeletal muscle contraction?
ACH is released at the end-plate potential. ACH diffuses into the sarcolemma, attaches to the receptors in the motor end plate and causes a change in the ions permeability that creates graded depolarization of the end-plate potential. Basically, it attaches to the receptors in the motor-end plate and creates the beginning process of triggering muscle contractions. 3. Describe .the process of excitation-contraction coupling in skeletal muscle fibers.The motor unit meets at the neuromusclular junction, where the axon terminal of a neuron and muscle fiber’s plasma membrane meet, also called the motor