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Questions and Answers
Smooth muscles are responsible for the contraction of smooth muscle tissue.
Smooth muscles are responsible for the contraction of smooth muscle tissue.
True (A)
Capillaries exclusively cause constriction and do not affect plasma permeability.
Capillaries exclusively cause constriction and do not affect plasma permeability.
False (B)
The primary function of smooth muscles is to facilitate relaxation of tissues.
The primary function of smooth muscles is to facilitate relaxation of tissues.
False (B)
Dilation of capillaries leads to a decrease in their permeability to plasma.
Dilation of capillaries leads to a decrease in their permeability to plasma.
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Smooth muscle contraction is not involved in the functioning of capillaries.
Smooth muscle contraction is not involved in the functioning of capillaries.
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Histamine is released from mast cells and causes a tertiary response.
Histamine is released from mast cells and causes a tertiary response.
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External histamine comes from injections and causes a weaker response.
External histamine comes from injections and causes a weaker response.
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Adrenaline acts as a vasoconstrictor and increases capillary permeability.
Adrenaline acts as a vasoconstrictor and increases capillary permeability.
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Alpha-agonists like adrenaline have an effect on blood vessel constriction.
Alpha-agonists like adrenaline have an effect on blood vessel constriction.
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Mast cells are responsible for the release of adrenaline in the body.
Mast cells are responsible for the release of adrenaline in the body.
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Mast cell destruction leads to the release of histamine.
Mast cell destruction leads to the release of histamine.
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Histamine release causes vasoconstriction of blood vessels.
Histamine release causes vasoconstriction of blood vessels.
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Vasodilatation at the site of injection is a direct action of histamine.
Vasodilatation at the site of injection is a direct action of histamine.
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Destruction of epidermal cells is a result of histamine release.
Destruction of epidermal cells is a result of histamine release.
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The site of injection experiences increased blood flow due to histamine's effects.
The site of injection experiences increased blood flow due to histamine's effects.
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Antihistamines block H2 receptors to reduce redness.
Antihistamines block H2 receptors to reduce redness.
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The primary role of antihistamines is to act as antagonists for histamine.
The primary role of antihistamines is to act as antagonists for histamine.
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Areas of reduced blood flow can be observed after antihistamine administration due to H1 receptor blockage.
Areas of reduced blood flow can be observed after antihistamine administration due to H1 receptor blockage.
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Antihistamines only minimize the effects of histamine related to capillary permeability.
Antihistamines only minimize the effects of histamine related to capillary permeability.
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Histamine contributes to the dilation of blood vessels when H1 receptors are activated.
Histamine contributes to the dilation of blood vessels when H1 receptors are activated.
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H1 receptors are found in blood vessels of the skin, bronchi, and intestine.
H1 receptors are found in blood vessels of the skin, bronchi, and intestine.
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H2 receptors are exclusively located in the blood vessels of the skin.
H2 receptors are exclusively located in the blood vessels of the skin.
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Antihistamines block H1 receptors only.
Antihistamines block H1 receptors only.
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H2 receptors play a role in the constriction of arterioles.
H2 receptors play a role in the constriction of arterioles.
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Only H1 receptors affect the permeability of capillaries.
Only H1 receptors affect the permeability of capillaries.
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Study Notes
Smooth Muscles
- Cause contraction
Capillaries
- Cause dilation
- Increased permeability to plasma
Mast Cell Destruction
- Releases histamine from the epidermis
- Causes vasodilation of blood vessels at the site of injection
Adrenaline
- Vasoconstrictor α- agonist
- Reduces capillaries permeability
Histamine and Antihistamines
- Antihistamines are pharmacological antagonists of histamine
- Antihistamines block only H1 receptors, not H2 receptors
- H1 receptors are found in blood vessels of the skin, bronchi, and intestines.
- H2 receptors are found in arterioles, capillaries, and parietal cells.
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Description
This quiz covers the roles of smooth muscles, capillaries, and the mechanisms of mast cell destruction in relation to histamine and antihistamines. It explores concepts such as vasodilation and vasoconstriction, focusing on the pharmacological effects of these substances on blood vessels. Test your understanding of how these interactions affect circulation and tissue response.
