Regulation questions | form three Biology

When a person is frightened blood sugar concentration , rate of heart beat and rate of breathing increases due to a rise in blood level of

• Thyroxin
• Insulin
• Androgens
• Adrenaline
• Glucagon

During the cold weather shivering occurs in mammal`s body in order to

1. to shake off coldness
2. generate heat
3. produce sweat
4. relax the muscles
5. exercise the muscles

When it is cold, one of the following happens to keep the body warm.
A. hairs of the skin lie down flat
B. warm blood flows close to the skin
C. the metabolic rate decreases
D. the metabolic rate increases.

Which of the following activites take palce together in the skin?

1. Vasodilation, sweating and shivering
2. Vasodilation, contraction of hair erector muscle and shivering
3. Muscle constriction, contraction of hair erector muscle and sweating
4. Vasodilation, sweating and relaxation of hair erector muscle.

Briefly describe how mammals are able to keep each of the following at constant levels in their body fluids.

1. Glucose
2. Water

During physical exercise body heat production increases. Explain the feedback mechanisms which will return the body to normal.

A rise in the temperature of a human body is corrected by

A construction of the skin arteries and sweating
B construction of the skin arteries and shivering
C dilation of the skin arteries and sweating
D dilation of the skin arteries and shivering
E shivering and sweating

Water and salts are needed in constant amount for effective functioning of the body. Briefly explain three factors which affect the content of salts and water in human body.

A patient has been diagnosed with low level of blood sugar. Which hormone would you recommend to regulate the victim’s sugar?

A Insulin
B Glucagon
C Antidiuretic
D Aldosterone
E Testosterone

Reptiles are organisms whose body temperature is affected by environmental temperature. Briefly explain three ways that help reptiles to survive in different weather conditions.