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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.
How does the contraction of the I band contribute to the overall function of skeletal muscle?
The contraction of the I band in skeletal muscle helps to shorten the muscle fibers, allowing for movement and muscle contraction. This contributes to the overall function of skeletal muscle by enabling the muscle to generate force and produce movement.
Do arterioles have valves?
No; arteries (and arterioles) depend on smooth muscle contraction, whereas veins (and venules) have valves.
Constriction and dilation of smooth muscle in is used to control blood pressure. capillaries venules arteries arterioles?
Constriction and dilation of smooth muscle primarily occur in arterioles to control blood pressure. By adjusting their diameter, arterioles regulate blood flow and resistance within the circulatory system, influencing overall blood pressure. When arterioles constrict, blood pressure increases, while dilation leads to a decrease in blood pressure. This mechanism is crucial for maintaining adequate blood flow and oxygen delivery to tissues.
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.
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.
How does inhibition helps to terminate skeletal muscle contraction?
Inhibition helps terminate skeletal muscle contraction primarily through the action of inhibitory neurotransmitters, such as glycine and gamma-aminobutyric acid (GABA), which decrease the excitability of motor neurons. This reduction in excitability leads to a decrease in the release of acetylcholine at the neuromuscular junction, effectively stopping the signal for muscle contraction. Additionally, the removal of calcium ions from the muscle cells, facilitated by the reuptake into the sarcoplasmic reticulum, also plays a crucial role in ceasing contraction by allowing the muscle fibers to relax. Together, these processes ensure that muscle contractions are regulated and can be terminated effectively.
When you take someone's blood pressure you are measuring the pressure during the contraction and relaxation phases of the heart muscle?
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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.
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 can you differentiate venules from arterioles?
Venules and arterioles can be differentiated based on their structure and function. Arterioles have thicker walls with more smooth muscle and elastic fibers, allowing them to regulate blood flow and pressure, while venules have thinner walls and less muscle, primarily functioning to collect deoxygenated blood from capillaries. Additionally, arterioles typically have a smaller lumen compared to venules, which are larger and more compliant to accommodate varying blood volumes. Histologically, arterioles may have a prominent internal elastic lamina, whereas venules do not.
Constant contraction of a muscle is?
constant contraction of a muscle is called the muscle tone
