Organisiation

Question 1

Levels of organisation in multicellular organism

Answer 1

Cells - tissue- organs - organ system

Question 2

Organelle

Answer 2

Specialised unit in cells specific func )mit, nucleus)

Question 3

Cell

Answer 3

basic building block in living organisms ( heart muscle cell)

Question 4

Tissue

Answer 4

Group of cells work together perform shared function (muscle )

Question 5

Organ

Answer 5

structure made of groups of different tissue - specific function (heart)

Question 6

Organ system

Answer 6

Group organs - work together specific function (circulatory system)

Question 7

Adaptations of effective exchange surfaces

Answer 7

1. LARGE SURFACE AREA= flat leaves, alveoli lungs , villi intestines
2. SHORT DIFFUSION DISTANCE= cell membrane, flat leaves, capillaries , capillarie wall one cell thick’s
   (3. efficient blood supply) = network of cappilaries surrounding alveoli/villi

Question 8

What gas exchange occurs in the lungs

Answer 8

O2 air-blood
Co2 is waste product X X X 💙💙💙💙✨✨
Blood - lungs- air

Question 9

Respiration system structure

Answer 9

trachea - bronchi - bronchioles - alvioli cartilage rings in walls keep it open when air drawn in
Lungs enclosed in thorax in 12 pairs of ribs
Ribs moved by intercostal muscles
Diaphragm m below lungs
🫁

Question 10

How are alveoli adapted for gas exchange

Answer 10

small = large sa: vol
millions
(short diffusion path, capillary / alveoli wall 1 cell thick)
(ventilation maintains high [grad]