Match the following columns: Column I Column II A. Vasoconstriction 1. Mammals B. Meissner's corpuscles 2. Less flow of blood in the blood vessel C. Pacinian corpuscles 3. Oily secretion D. Sebaceous gland 4. Sense of pressure E. Endothermal 5. Sense of touch

A - 2 Vasoconstriction means narrowing of the blood vessels which reduces the volume or space inside the affected blood vessels and hence the blood vessel volume is lowered, blood flow is also reduced. At the same time, the resistance or force of blood flow is also raised. This causes higher blood pressure. This process is essential for maintaining body temperature in homeotherms. B - 5 Meissner corpuscles consist of a cutaneous nerve ending responsible for transmitting the sensations of touch. Meissner corpuscles are most sensitive to low-frequency vibrations between 10 to 50 Hertz and can respond to skin indentations of less than 10 micrometres. C - 4 The skin contains many sensory receptors. Pacinian corpuscles are nerve endings in the skin responsible for sensitivity to high-frequency vibration and deep pressure. D -3 The Sebaceous glands are lobulated glands consisting of many sacs that open into hairy follicle by a common duct. The epithelium layer of these glands secretes an oily secretion called sebum. It lubricates the hair, makes skin oily and waterproof and also prevents drying of the skin. E - 1 Human beings belong to the class Mammalia and are warm-blooded animals. Endothermal means warm-blooded animals whose body temperature remains the same irrespective of the outside temperature. Column I Column II A. Vasoconstriction 2. Less flow of blood in the blood vessel B. Meissner's corpuscles 5. Sense of touch C. Pacinian corpuscles 4. Sense of pressure D. Sebaceous gland 3. Oily secretion E. Endothermal 1. Mammals

E M B I B E

All In One ICSE Biology>Chapter 11 - The Skin>Chapter Exercise (True or false)>Q 6

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9th ICSE

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Increased body heat causes vasoconstriction.

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Important Questions on The Skin

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9th ICSE

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All In One ICSE Biology>Chapter 11 - The Skin>Chapter Exercise (True or false)>Q 6

Frog is a cold-blooded animal.

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9th ICSE

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All In One ICSE Biology>Chapter 11 - The Skin>Chapter Exercise (True or false)>Q 6

Humans are ectothermic.

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All In One ICSE Biology>Chapter 11 - The Skin>Chapter Exercise (Match the coumns)>Q 7

Match the following columns:

Column I	Column II
A. Vasoconstriction	1. Mammals
B. Meissner's corpuscles	2. Less flow of blood in the blood vessel
C. Pacinian corpuscles	3. Oily secretion
D. Sebaceous gland	4. Sense of pressure
E. Endothermal	5. Sense of touch