cells + controls // growth in animals

Question 1

Describe is growth in animals

Answer 1

An increase in cell number and size.

Question 2

Give examples of specialised animal cells

Answer 2

• Muscle Cell
• Nerve Cell
• Ciliated Epithelial Cell
• Red Blood Cell
• White Blood Cell
• Sperm Cell
• Egg Cell

Question 3

Describe how the muscle cell is specialised and adapted to its function

Answer 3

bring parts of the body closer together. They contain protein fibres that can contract when energy is available, making the cells shorter

Question 4

Describe how the nerve cell is specialised and adapted to its function

Answer 4

• they have a long fibre (axon ) so they can carry messages up and down the body over long distances.
• in a stimulated neurone, an electrical nerve impulse passes along the axon.
• the axon is insulated by a fatty (myelin) sheath - the fatty sheath increases the speed of the nerve impulses along the neurone.

Question 5

Describe how the red blood cell is specialised and adapted to its function

Answer 5

• they contain haemoglobin - a red protein that combines with oxygen.
• they have no nucleus so they can contain more haemoglobin.
• they have a large surface area to carry more oxygen

Question 6

Explain why cell differentiation is important in the development of specialised cells

Answer 6

Differentiated cells are important in a multicellular organism because they are able to perform a specialised function in the body.