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What type of muscle contraction will shorten a muscle and decrease the angle between two bones?
Concentric muscle contraction will shorten a muscle and decrease the angle between two bones. This type of contraction involves the muscle generating force as it shortens to move a body part.
Why are the arterioles known as resistance vessels?
A. They distribute blood to various parts of the body. B. They contain a large quantity of elastic tissue. C. The contraction and relaxation of the smooth muscle in their walls can change their diameter. D. Their prime function is the exchange of nutrients and wastes between the blood and tissue cells.
How would a drug that interferes with cross bridge formation affect muscle contraction?
A drug that interferes with cross-bridge formation would prevent the myosin heads from binding to actin filaments, impairing the sliding filament mechanism essential for muscle contraction. This would result in a decrease in muscle force generation and overall muscle contraction efficiency.
What movement does not increase or decrease the angle between bones?
Isometric contraction is a type of muscle movement that does not result in any change in the angle between bones. This type of contraction involves the muscle producing force without changing its length or causing movement at a joint.
What causes muscle contraction in the leg?
Muscle contraction in the leg is caused by the interaction between nerve signals from the brain and the muscle fibers. When the brain sends a signal to the muscle, it triggers the release of calcium ions, which then bind to proteins in the muscle fibers, leading to the contraction of the muscle.
Do arterioles have valves?
No; arteries (and arterioles) depend on smooth muscle contraction, whereas veins (and venules) have valves.
What type of muscle contraction will shorten a muscle and decrease the angle between two bones?
Concentric muscle contraction will shorten a muscle and decrease the angle between two bones. This type of contraction involves the muscle generating force as it shortens to move a body part.
Why are the arterioles known as resistance vessels?
A. They distribute blood to various parts of the body. B. They contain a large quantity of elastic tissue. C. The contraction and relaxation of the smooth muscle in their walls can change their diameter. D. Their prime function is the exchange of nutrients and wastes between the blood and tissue cells.
How would a drug that interferes with cross bridge formation affect muscle contraction?
A drug that interferes with cross-bridge formation would prevent the myosin heads from binding to actin filaments, impairing the sliding filament mechanism essential for muscle contraction. This would result in a decrease in muscle force generation and overall muscle contraction efficiency.
When you take someone's blood pressure you are measuring the pressure during the contraction and relaxation phases of the heart muscle?
true
Why arterioles6 times thicker than the average venule?
The arterioles wall contains smooth muscle and elastic fibers and is six times thicker to handle the higher pressure in the arterioles. The venule is like a giant capillary.
Constant contraction of a muscle is?
constant contraction of a muscle is called the muscle tone
Why artery called resistance vessels?
The contraction and relaxation of the smooth muscle in their walls can change their diameter, thus changing the level of pressure (large diameter yields low pressure and smaller diameter yields high pressure).
How does changing the diameter of arterioles control blood pressure and flow?
Increased diameter of the arterioles decreases rather increases blood pressure. The heart rate also lowers as the heart does not have to pump blood as hard to get it to flow through the wider the arterioles.
What effects do calcium slow channels have on shortening or lengthening the contraction time of the heart muscle?
Calcium slow channels play a crucial role in regulating the entry of calcium into cardiac muscle cells. Activation of these channels during the action potential leads to an influx of calcium, ultimately prolonging the duration of contraction in the heart muscle. Inhibition of these channels can lead to a decrease in contraction time by reducing the amount of calcium available for muscle contraction.
What movement does not increase or decrease the angle between bones?
Isometric contraction is a type of muscle movement that does not result in any change in the angle between bones. This type of contraction involves the muscle producing force without changing its length or causing movement at a joint.
Is Vasodilation is a widening of the lumen due to smooth muscle contraction?
No.Vasodilatation, ie, widening of vascular lumen is caused due to vascular smooth muscles' relaxation.While, vasoconstriction, ie, decrease in diameter of the lumen is caused due to smooth muscle contraction.
