B1: Cells

Question 1

Neurone (4)

Answer 1

-Long and thin
-Have a myelin sheath to prevent loss of impulse
-Form connections with other neurones
-Can carry electrical impulses in 1 direction

Question 2

Sperm (4)

Answer 2

-Digestive enzymes to break outer layer of egg
-Lots of mitochondria for lots of energy needed to swim towards egg
-Long tail to aid when swimming

Question 3

Red blood cells (4)

Answer 3

-Large surface area for fast diffusion of gases
-Small diameter so it can fit through smallest capillaries
-No nucleus so there’s more space for haemoglobin
-Haemoglobin for oxygen to easily attach to

Question 4

Root hair (3)

Answer 4

-Found close to xylem so it can easily transport water to it
-Thin membrane for fast osmosis of water
-Large surface area for fast diffusion