or tetanise (ˈtɛtəˌnaɪz ) verb. (transitive)
to induce tetanus in
(a muscle); affect (a muscle) with tetanic
Why cardiac muscles Cannot be Tetanized?
Consequently, a fresh contraction cannot occur before the completion of the previous mechanical response. Thus,
mechanical responses of ventricular muscle cannot be merged
, and therefore cardiac muscle cannot be tetanized (Application Box 86.1).
What is Tetanization of muscle?
A tetanic contraction (also called tetanized state,
tetanus
, or physiologic tetanus, the latter to differentiate from the disease called tetanus) is a sustained muscle contraction evoked when the motor nerve that innervates a skeletal muscle emits action potentials at a very high rate.
What is the meaning of Tetanised?
1.
To stimulate a muscle by a rapid series of stimuli
so that the individual muscular responses (contractions) are fused into a sustained contraction. 2. To cause tetanus (2) in a muscle.
Can smooth muscles Tetanize?
Smooth muscle can be
stimulated by pacesetter cells
, by the autonomic nervous system, by hormones, spontaneously, or by stretching. The fibers in some smooth muscle have latch-bridges, cross-bridges that cycle slowly without the need for ATP; these muscles can maintain low-level contractions for long periods.
What are some causes of muscle fatigue?
- Addison’s disease.
- age.
- anaerobic infections.
- anemia.
- anxiety.
- botulism.
- cerebral palsy.
- chemotherapy.
What is the meaning of muscle fatigue?
1
. Muscle fatigue is defined as
a decrease in maximal force or power production in response to contractile activity
.
5
. It can originate at different levels of the motor pathway and is usually divided into central and peripheral components.
What controls the contraction of cardiac muscle?
Contraction in cardiac muscle occurs due to the the
binding of the myosin head to adenosine triphosphate ( ATP )
, which then pulls the actin filaments to the center of the sarcomere, the mechanical force of contraction.
How fast does cardiac muscle contract?
They generate an action potential at the rate of
about 70 per minute
in humans (your heart beat). From the sinus node, activation propagates throughout the atria, but cannot propagate directly across the boundary between atria and ventricles, as noted above.
Why cardiac muscles do not fatigue?
Unlike other muscle cells in the body,
cardiomyocytes are highly resistant to fatigue
. True, cardiomyocytes are primarily powered by mitochondria (the energy house of the cell), similar to your other muscles. However, cardiomyocytes have as much as 10 times the density of mitochondria, skyrocketing their energy output.
What is the difference between tetanus and muscle tetany?
Muscle cramps caused by the disease
tetanus are not classified as tetany
; rather, they are due to a lack of inhibition to the neurons that supply muscles. Tetanic contractions (physiologic tetanus) are a broad range of muscle contraction types, of which tetany is only one.
What is Syncytium?
Listen to pronunciation. (sin-SIH-shee-um)
A large cell-like structure formed by the joining together of two or more cells
. The plural is syncytia.
What is strongest muscle in the human body?
The strongest muscle based on its weight is
the masseter
. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars.
What is the main function of smooth muscle?
The primary function of smooth muscle is
contraction
. Smooth muscle consists of two types: single-unit and multi-unit. Single-unit smooth muscle consists of multiple cells connected through connexins that can become stimulated in a synchronous pattern from only one synaptic input.
What are the two types of smooth muscle?
Smooth muscles are of two types. They are:
Single-unit (visceral) smooth muscle
: All the cells function collectively and simultaneously as a single unit (unitary). Multiunit smooth muscle: It is a type of muscle in which all the cells cannot function collectively and work independently.
What does muscle wasting feel like?
Gradual difficulty walking and speaking
, memory loss, tingling or weakness of extremities. Impaired balance and coordination. Loss of muscle coordination. Numbness or tingling in arms or legs.
