Excretion

Question 1

Excretion

Answer 1

the removal of metabolic waste from a cell

Question 2

Ectotherms

Answer 2

gain or lose heat from or to their external environment e.g frogs and snakes

Question 3

Endotherms

Answer 3

generate their own heat from metabolic reactions e.g humans and cats

Question 4

The skin consists of:

Answer 4

-outer epidermis
-inner dermis

Question 5

Keratin

Answer 5

waterproof protein from which nails and hair are made

Question 6

Melanin

Answer 6

specialised cells in the malphighian layer produce a brown or black pigment

Question 7

Collagen

Answer 7

strengthening protein

Question 8

Piloerection

Answer 8

erector muscles contract causing hair to stand up

Question 9

Vasoconstriction

Answer 9

blood vessels in skin contract

Question 10

Perspiration

Answer 10

sweat produced is evaporated from skin, cooling us

Question 11

Vasodilation

Answer 11

blood vessels expand which increases heat loss. this is why we go red in the face after exercise

Question 12

Renal vein

Answer 12

Carries blood from kidney to heart. This blood is filtered.

Question 13

Renal artery

Answer 13

Carries blood from heart to kidney .This blood is unfiltered

Question 14

Osmosis

Answer 14

The movement of water particles from a region of higher concentration to a region of lower concentration across a semi permeable membrane-passive

Question 15

Diffusion

Answer 15

The movement of particles from a high concentration to low concentration- passive

Question 16

Active Transport

Answer 16

Movement of particles from low concentration to high concentration- requires energy