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AHCDW7SOL107.pdf - 107 Award 1.00 point Problems Adjust...

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Unformatted text preview: 107. Award: 1.00 point Problems? Adjust credit for all students. There are two types of smooth muscle: multiunit and single-unit. Click and drag each label into the appropriate category based on whether it pertains to multiunit smooth muscle, single-unit smooth muscle, or both. blood on light focusing Assists gap by other toeach Connected Constricts Contract respiratory inthe Found visceral as known Also Also known as visceral muscle Constricts the pupil Multiunit Found in the respiratory passages Found in the urethra Contract individually Connected to each other by gap junctions Assists in focusing light on the retina Found in blood vessels Single-Unit Both Contract individually Also known as visceral muscle Found in the respiratory passages Constricts the pupil Found in the urethra Found in blood vessels Assists in focusing light on the retina Connected to each other by gap junctions Explanation: Smooth muscle tissue shows a range of types between two extremes called multiunit and single­unit types. Multiunit smooth muscle occurs in some of the largest arteries and pulmonary air passages, the piloerector muscles, and muscles that control the iris and lens of the eye. Multiunit smooth muscle does not generate action potentials. It may contract in response to variable (graded) electrical changes in the sarcolemma or even in the absence of electrical excitation. Single­unit (unitary) smooth muscle is more common. It occurs in most blood vessels and in the digestive, respiratory, urinary, and reproductive tracts—therefore, it is also called visceral muscle. This is the type that forms the aforementioned layers in many of the hollow viscera. The name single­unit refers to the fact that the myocytes of this type of muscle are electrically coupled to each other by gap junctions. This allows them to directly stimulate each other, so a large number of cells contract as a unit, almost as if they were a single cell. In this muscle type, the nerve fiber varicosities are not associated with a specific myocyte, but stimulate several of them at once when they release neurotransmitter into the muscle tissue. Hints Hint #1 References eBook & Resources ...
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