Vasocontriction and Vasodilation

Q. Question 34
Animals of colder regions and fishes of cold water have thicker layer of subcutaneous fat. Describe why?

Q.

What are third-degree burns?

Q.

What is thermo regulation?

Q.

How does the skin help in storing food?

Q.

What does the fluid connective tissue consists of?

Q.

Question 34
Animals in cold regions and fish in cold water have a thicker layer of subcutaneous fat under their skin. Justify.

Q. The statements given below have some parts printed in bold face. In case these parts are incorrect, rewrite these in correct form.
(d) Vigorous activity on a cold day overheats you.

Q. Vasodilation involves the, dilation of _____.

1. Pupils
2. Blood vessels
3. Sebaceous glands
4. Meibomian glands

Q. What causes vasoconstriction?

1. Increased body heat.
2. Dilation of blood vessels in the skin.
3. Air movements over the body.
4. Broadening of blood vessels

Q.

What is the rule of nines?

Q.

You are on a holiday to the beautiful, but hot Thar desert. Which of the following might happen in your body, in response to the high temperature?

1. Vasoconstriction

2. Shivering

3. Sweating

4. Vasodilation

Q.

Animals of colder region and fishes of cold water have thick layer of subcutaneous fat. Discuss.

Q.

Is exercise good for coronary artery disease?

Q.

The type of blood vascular system, in which blood flows inside blood vessels is called _____.

1. Closed

2. Open

3. Integrated

4. Non- Integrated

Q.

Which of this is likely to happen in a person who is engaged in strenuous physical work?

1. Vasodilation

2. Vasoconstriction

3. Blood circulation reduces

4. Production of acne decreases

Q. Following are the events which takes place during vasoconstriction, except.

1. Person looks pale.
2. Blood supply to the skin increases.
3. Narrowing of blood vessels.
4. Body loses heat

Q.

State true or false:

Vasodilation decreases the blood flow to the skin.

1. True

2. False

Q.

What causes vasoconstriction?

1. Dilation of blood vessels in the skin

2. Cold outside temperature

3. Air movements over the body

4. Broadening of blood vessels

Q. Why animals of colder regions and fishes of cold water have thicker layer of subcutaneous fat?

1. Fat acts as subcutaneous insulation of body
2. Fat causes thermoregulation
3. Fat causes thermodisregulation
4. Both A and B

Q. SHORT ANSWER TYPE
Why do you shiver and why do your teeth chatter when it is very cold in winter ?

Q.

Vasodilation is a process which involves dilation of ___.

1. Pupils

2. Sebaceous glands

3. Blood vessels

4. All of these

Q.

Which of this is likely to happen in a person who is engaged in strenuous physical work?

1. Vasodilation

2. Vasoconstriction

3. Blood circulation reduces

4. Production of acne decreases

Q. In summer the urine is slightly thicker than in winter. Explain the reason.

Q.

What happens to your skin's blood vessels as you exercise?

1. They remain the same

2. They become wider

3. They become narrower

4. They burst

Q.

When the environmental temperature is low, our blood vessels constrict, minimising blood flow near the skin.

1. False

2. True

Q. Animals with built-in thermostat are

1. Biothermic
2. Oliogothermic
3. Poikilothermic
4. Homeothermic

Q. Membranous partition between pericardial cavity and pleuropericardial cavity is

1. Diaphragm
2. None of the above
3. Septum transversum
4. Mediastinal septum

Q. Homeothermy in humans is maintained through

1. Thermoreceptors
2. Negative feed-back loop
3. Cold receptors
4. Warm receptors

Q.

What is the use of blood capillaries in maintaining body temperature

Q. Which of the following animals can keep their body temperature constant?

1. Sparrows and frogs
2. Sharks and sea horses
3. Whales and bats
4. Frogs and snakes