What is meant by extensibility of muscle?

What is meant by extensibility of muscle?

Muscle extensibility: ability of a muscle to extend to a predetermined endpoint.

What is the difference between contractility and extensibility?

Contractility allows muscle tissue to pull on its attachment points and shorten with force. ( muscles can only pull, never push.) Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone. Extensibility is the ability of a muscle to be stretched or extended.

Why is extensibility important in muscle tissue?

Extensibility is the ability of a muscle to be stretched. For instance, let’s reconsider our elbow flexing motion we discussed earlier. In order to be able to flex the elbow, the elbow extensor muscles must extend in order to allow flexion to occur. Lack of extensibility is known as spasticity.

How is the excitability of cardiac muscle different than that of skeletal muscle?

Self Excitability: Unlike skeletal muscle, which contracts in response to nerve stimulation, and like single unit smooth muscle, cardiac muscle is myogenic, meaning that it is self-excitable stimulating contraction without a requisite electrical impulse coming from the central nervous system.

What is extensibility quizlet?

extensibility. the ability to be stretched or extended. elasticity. the ability to recoil and resume the original resting length.

Why is cardiac muscle not Tetanized?

Another significant difference in excitability is that heart muscle cannot be tetanized (i.e., induced to spasm) by the application of repetitive stimuli (see above Striated muscle), thus ensuring the completion of the contraction/relaxation cycle and the effective pumping of blood.

Do all muscles have excitability?

Muscle is a principal tissue type, Specialized for contraction. Like neurons, muscle is an excitable tissue, in that it can conduct or transmit electrical impulses (respond to stimuli). All muscle tissues have 4 characteristics in common: excitability.

What is a triad in a muscle fiber?

In the histology of skeletal muscle, a triad is the structure formed by a T tubule with a sarcoplasmic reticulum (SR) known as the terminal cisterna on either side. Each skeletal muscle fiber has many thousands of triads, visible in muscle fibers that have been sectioned longitudinally.

What is the difference between extensibility and excitability of a muscle?

Thus, muscles can only pull, never push. Excitability is the ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone. Extensibility is the ability of a muscle to be stretched. For instance, let’s reconsider our elbow flexing motion we discussed earlier.

Why does muscle tissue have elasticity and contractility?

It can recoil back to its original length due to elastic fibers. Muscle tissue also has the quality of extensibility; it can stretch or extend. Contractility allows muscle tissue to pull on its attachment points and shorten with force.

How does the nervous system affect the excitability of skeletal muscle?

While the nervous system can influence the excitability of cardiac and smooth muscle to some degree, skeletal muscle completely depends on signaling from the nervous system to work properly. On the other hand, both cardiac muscle and smooth muscle can respond to other stimuli, such as hormones and local stimuli.

What is the difference between elasticity and extensibility?

Lack of extensibility is known as spasticity. Elasticityis the ability to recoil or bounce back to the muscle’s original length after being stretched. **You may use the buttons below to go to the next or previous reading in this Module**