B1f Part 1 Staying In Balance

Question 1

Negative feedback mechanisms

Answer 1

Used in homeostasis to maintain a constant internal environment

Sweating is used to reduce body temperature so back to normal

Question 2

Sweating

Answer 2

Increases Heat transfer to environment
Evaporation
Removes heat from skin

Question 3

Optimum temperature for the action of many enzymes (body temperature)

Answer 3

37°C

Question 4

High temperatures can cause

Answer 4

Heat stroke
Dehydration

Death

Question 5

Low temperatures can cause

Answer 5

Hypothermia

Death

Question 6

Blood temperature is measured by

Answer 6

Hypothalamus gland in the brain which will bring about temperature control mechanisms via the nervous and hormonal systems

Question 7

Vasodilation

Answer 7

Sweating
 Blood vessels near surface of skin dilate
More blood flows near skin
more heat transferred to environment
Cooler

Question 8

Vasoconstriction

Answer 8

Blood vessels constrict

Less blood near skin
Less heat lost to environment
Get warmer

Question 9

Homeostasis

Answer 9

Maintaining constant internal environment involves balancing bodily inputs and outputs