Chapter 33 :Excretion

Question 1

What is homeostasis?

Answer 1

the maintenance of a constant internal environment

Question 2

Why do living things need to control their temperature?

Answer 2

to maintain metabolic function ,pH control, temperature and fluid balance

Question 3

Functions of skin:

Answer 3

Protection: Barrier preventing pathogens from entering

Warmth(adipose tissue)

Makes melanin to protect to UV radiation

Food storage(adipose tissue)

Sense organ(nerve fibers for touch)

Question 4

Temperature Regulation(Cold Conditions)

Answer 4

Cold Conditions:
1.Piloerection: hairs stand up to trap layer of heat to keep you warm

2.Vasodilation: is when blood vessels move away from the skin to Retain heat

Question 5

Where is urine

(a) made
(b) stored
(c) excreted

Answer 5

(a) kidneys
(b) bladder
(c) urine

Question 6

What hormone control urine volume and where is it made?

Answer 6

ADH (anti-diuretic-hormone)

pituitary gland

Question 7

Temperature Regulation(Warm Conditions)

Answer 7

Warm Conditions:
1.Pespiration: water droplets are on the skin to cool down

2.Vasoconstriction: blood vessels move closer