REMEMBER IT!

• Cells specialise through cell differentiation.
• Adults contain stem cells which divide and differentiate during cell turnover or to repair damage.
• Cells aggregate to form tissues.
• Organs are comprised of one or more type of tissue.
• Organs that function together are known as a system.

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TEST IT!

1.

Cells for repair divide by mitosis.
a. What’s the process called by which they specialise
b. What’s a stem cell? c. One function of stem cells is repair in adults. Name another function.

2.
Give an example for each of the following in animals.
a. A tissue _____________________________________

b. An organ ____________________________________

c. A system ____________________________________

ANSWERS

1.

a. Cell differentiation

b. A stem cell is an unspecialised cell.

c. Repair

2.

a. Answers include:

i. muscle tissue
ii. nervous tissue
iii. connective tissue
iv. epithelia

b. Answers include:

i. heart
ii. brain
iii. liver
iv. kidney

c. Answers include:

i. circulatory
ii. respiratory
iii. immune
iv. skeletal
v. digestive
vi. nervous
vii. reproductive
viii. excretory
ix. integumentary