Excretion

Question 1

What is excretion?

Answer 1

Getting rid of waste products of metabolism

Question 2

Homeostasis

Answer 2

Is the internal environment in an organism

Question 3

Ectotherms

Answer 3

Animals that obtain heat from external sources

Question 4

Endotherms

Answer 4

Generate heat from their own bodies reactions

Question 5

Skin is composed of what?

Answer 5

Epidermis and dermis

Question 6

What is epidermis?

Answer 6

Makes new cells and contains melanin.

Question 7

What is dermis ?

Answer 7

Contains a strong protein called collagen.

Has many blood vessels, sweat glands, hairs, sebaceous glands and nerve receptors.

Question 8

Functions of skin:

Protection

Answer 8

Epidermis protects against damage, water loss & entry of pathogens.
Melanin protects against ultraviolet radiation.

Question 9

Functions of skin:

Vitamin production

Answer 9

Vitamin D is made

Question 10

Functions of skin:

Food storage

Answer 10

Fat stores energy

Question 11

Functions of skin:

Sense organ

Answer 11

The skin senses touch, pain and tempature

Question 12

Functions of skin:

Excretion

Answer 12

Sweat removes water and salts from the body

Question 13

Funtions of skin:

Cold conditions

Answer 13

Hairs stand up to keep skin warm.
Blood vessels become narrow to retain heat.
Shivering.

Question 14

Functions if skin:

Warm conditions

Answer 14

Sweating cools the body by evaporation.

Blood vessels widen to lose heat.

Question 15

What are the main excretory organs?

Answer 15

Lungs ( water & carbon dioxide )
Skin ( water & sats )
Kidneys ( water, salt & urea )

Question 16

What is the urinary system?

Answer 16

Consits of two kidneys, the bladder & urethra

Question 17

Where is urine stored ?

Answer 17

In the bladder

Question 18

Where is urine excreted?

Answer 18

Through the urethra

Question 19

Functions of kidneys

Answer 19

Excretes water, salts and urea.

Osmoregulation: controls the water content and the salt concentration of the blood.

Question 20

Where are the nephrons located?

Answer 20

The cortex and medulla

Question 21

What is the glomerular flitrate?

Answer 21

A dilute solution of waste and useful molecules

Question 22

Name a hormone?

Answer 22

Anti-diuretic hormone ( ADH )

Question 23

Where is ADH released?

Answer 23

The pituitary gland

Question 24

What does ADH control?

Answer 24

The volume of urine

Question 25

When is ADH realeased?

Answer 25

When plasma has too little water or too much salt

Question 26

When is ADH not released?

Answer 26

When we drink a lot of water or consume a low salt diet