SB2b Growth in Animals

Question 1

Define growth in animals as an increase in cellnumber and size.

Answer 1

Growth, the increases in cell size and number that take place during the life. Only at the beginning.

Question 2

Give examples of specialised animal cells. Red Blood Cell

Answer 2

Transport oxygen for aerobic respiration, must able to absorb oxygen in lungs, pass through narrow vessel, release oxygen to respiring cells, contain haemoglobin- red protein combines with oxygen, have no nucleus so have more hemoglobin.
they are small and flexible so that they can fit through narrow blood vessels
they have a biconcave shape (flattened disc shape) to maximise their surface area for oxygen absorption

Question 3

Give examples of specialised animal cells.Fat Cell

Answer 3

store excess fat
small amount of cytoplasm, and load more fat
few mitochondria, little energy
expand up to 1000 times, orignal size

Question 4

Give examples of specialised animal cells.Muscle Cell

Answer 4

Made for contraction
Long, more space to contract
Lots of mitochondria

Question 5

Explain why cell differentiation is important in

the development of specialised cells.

Answer 5

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