human Anatomy and Physiology aid » equipment Physiology » Musculoskeletal Physiology » Muscle Physiology » assist with Smooth Muscle Physiology
Explanation:

Of the three major muscle groups, smooth muscle is the only type not written of sarcomeres. Together a result, smooth muscle does not appear striated under a microscope. Smooth muscle is under involuntary control, innervated by the autonomic nervous system, and also contains mononucleated cells.

You are watching: Which muscle cell type has visible striations but is not under voluntary control?

Skeletal muscle is striated, multinucleated, and also under spontaneous control. Cardiac muscle is striated, mononucleated, and also under involuntary control.


Three muscle cells are inserted side by side.

In muscle cell 1, striations are clearly visible.

In muscle cell 2, striations are likewise present, through sharp discs periodically discovered along muscle fibers. Additional examination shows void junctions between adjacent cells.

In muscle cell 3, no striations are present.


A doctor takes a sample of tissue from a patient"s leg. The sample includes both sections of the extensor hallicus longus, as well as sweat glands serving the anterior tibial surface. Through regard to the muscle cell species described, which 2 muscle varieties are most likely to be found in this sample?


Explanation:

The physician has actually removed a sample of skeleton muscle (the extensor hallicus longus) as well as smooth muscle, which generally surrounds structures prefer sweat glands.

The smooth muscle is not under voluntarily control and uses a unique mechanism of contraction, different from the striated pattern supposed of sarcomeres in skeletal muscle. Instead of sarcomeres, smooth muscle contract by utilizing myosin irradiate chain kinase come phosphorylate myosin, which have the right to then interact with actin to cause a contraction. Due to the lack of striations, we have the right to conclude the muscle kind 3 corresponds to smooth muscle, and will be present in the sample.

Skeletal muscle is recognized for having distinctive striations. Gap junctions, as seen in muscle kind 2, would certainly be characteristic just of cardiac muscle, and would not be found in bones muscle. We deserve to conclude that muscle form 1 is skeleton muscle, and will be existing in the sample.


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Example concern #3 : assist With Smooth Muscle Physiology


Which muscle tissue kind lacks striations?


Possible Answers:

Voluntary muscle


Cardiac muscle


Multinucleated muscle


Skeletal muscle


Smooth muscle


Correct answer:

Smooth muscle


Explanation:

There space three primary species of muscle tissue: smooth, skeletal, and cardiac. Bones muscle and cardiac muscle room striated, however smooth muscle is not.

Striations are formed by the arranged units that actin and and myosin (sarcomeres) in a linear pattern. Smooth muscle still supplies the mechanics that actin and also myosin to create contractile forces, yet the filaments room not organized right into sarcomeres. As a result, smooth muscle cells space not as straight as bones or cardiac muscle cells and contraction will not an outcome in the standard "shortening" the the cell. Rather, convulsion of a smooth muscle cell will reason the entirity the the cell to shrink inward. This is essential for smooth muscle functions that cause a palliation in surface ar area, such together the constriction that boold vessels.


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Example concern #4 : aid With Smooth Muscle Physiology


What are the two varieties of smooth muscle cells?


Possible Answers:

Central and also peripheral


Somatic and also autonomic


Smooth and rough


Single-unit and also mult-unit


Correct answer:

Single-unit and mult-unit


Explanation:

One that the two species of smooth muscle cells is referred to as single-unit, wherein the cell are connected by space junctions and also the cells contract together a single unit. The other type of smooth muscle is referred to as multi-unit, wherein the cells are not linked and each cell has to be individually stimulated. Single-unit cells room often found in the GI tract. A an excellent example that mulit-unit cells would be in vascular smooth muscle. 


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Example inquiry #5 : assist With Smooth Muscle Physiology


Which that the complying with is true about smooth muscle?


Possible Answers:

It has thick and also thin filaments


It is arranged in sarcomeres


It has thin filaments only


It appears striated


Correct answer:

It has actually thick and also thin filaments


Explanation:

Smooth muscle has actually thick and also thin filaments that room not arranged in sarcomeres. Thus, smooth muscle does not appear striated, and appears homogenous. Smooth muscle comes in various species including: multi-unit smooth muscle, unitary (single unit) smooth muscle, and vascular smooth muscle.


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Example concern #6 : help With Smooth Muscle Physiology


Which subtype that smooth muscle is found in the iris and vas deferens?


Possible Answers:

Multi-unit smooth muscle


Striated smooth muscle


Unitary smooth muscle


Vascular smooth muscle


Correct answer:

Multi-unit smooth muscle


Explanation:

Smooth muscle comes in various types including: multi-unit smooth muscle, unitary (single unit) smooth muscle, and also vascular smooth muscle. Multi-unit smooth muscle is existing in the iris, ciliary muscle of the lens, and also vas deferens. The behaves as different motor units and also has little to no electrical coupling in between cells. It is densely innervated and contraction is managed by neural innervation. Unitary smooth muscle is the most common kind of smooth muscle and is present in the uterus, gastrointestinal tract, ureter, and bladder. It is spontaneously active (has sluggish waves) and has “pacemaker” task that is modulated by hormones and neurotransmitters. Over there is a high degree of electrical coupling and permits for combination contraction. Vascular smooth muscle has actually properties of both multi-unit and single unit smooth muscle. Smooth muscle is no striated.


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Example question #41 : Muscle Physiology


Which subtype that smooth muscle deserve to you discover in the uterus, bladder, and also gastrointestinal tract?


Possible Answers:

Unitary smooth muscle


Multiunit smooth muscle


Vascular smooth muscle


Striated smooth muscle


Correct answer:

Unitary smooth muscle


Explanation:

Smooth muscle come in various varieties including: multi-unit smooth muscle, unitary (single unit) smooth muscle, and vascular smooth muscle. Unitary smooth muscle is the many common kind of smooth muscle and also is existing in the uterus, gastrointestinal tract, ureter, and bladder. That is spontaneously active (has slow waves) and also has “pacemaker” task that is modulated by hormones and also neurotransmitters. Many thanks to electric coupling this muscle subtype is able to have coordinated contraction.

Multi unit smooth muscle is current in the iris, ciliary muscle of the lens, and also vas deferens. That has little to no electrical coupling between cells for this reason acts as different motor units. Thus it is controlled by neural innervation, and is therefore densely innervated. Vascular smooth muscle shares properties that both multi-unit and single unit smooth muscle.


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Example concern #42 : Muscle Physiology


What are the preganglionic and postganglionic neurotransmitters of the sympathetic concerned system, respectively?


Possible Answers:

preganglionic is acetylcholine; postganglionic is norepinephrine


preganglionic is norepinephrine; postganglionic is norepinephrine


preganglionic is acetylcholine; postganglionic is acetylcholine


preganglionic is norepinephrine; postganglionic is acetylcholine


Neither preganglionic or postganglionic neurons of the sorry nervous mechanism use acetylcholine or norepinephrine.


Correct answer:

preganglionic is acetylcholine; postganglionic is norepinephrine


Explanation:

The sorry nervous device signals the activation the the fight-or-flight an answer in the body (including enhanced heart, blood vessel and also eye pupil dilation, and also increased stress hormone release). The sympathetic nervous mechanism signal is sent via 2 chains that neurons — the preganglionic neuron and the postganglionic neuron. The preganglionic neuron provides the neurotransmitter acetylcholine. The postganglionic neuron supplies the neurotransmitter norepinephrine.


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