Science Revision for Year 8 Biology

Goes over the anatomy and function of the heart, respiratory system, and digestive system ;D.

1

Superior Vena Cava

2

Aorta

3

Pulmonary Artery

4

Pulmonary Vein

5

Mitral Valve

6

Aortic Valve

7

Left Ventricle

8

Left Atrium

9

Right Ventricle

10

Right Atrium

11

Pulmonary Valve

12

Tricuspid Valve

Which parts of the heart carry oxygenated blood?

Aorta, pulmonary veins, left atrium, left ventricle, pulmonary artery/veins.

Which parts of the heart carry de-oxygenated blood?

Right ventricle and atrium, Superior and inferior Vena Cava.

Order of Oxygenated blood.

Pulmonary Veins, Left Atrium, Mitral Valve, Left Ventricle, Aortic Valve, Aorta

Order of De-Oxygenated Blood

Superior and Inferior Vena Cava, Right Atrium, Tricuspid Valve, Right Ventricle, Pulmonary Valve, Pulmonary Artery

Order of events in the lungs:

Nasal Passage / Mouth, Epiglottis, Larynx, Trachea (windpipe), Bronchi, Bronchioles (a lot of them), Aveoli.

Nasal Passage / Mouth

Warms and humidifies air

Epiglottis

Trapdoor which is passively closed over the digestive system.

Larynx

Contains Vocal Cords

Trachea / Windpipe

Passageway from larynx to lungs

Bronchi

The 2 passages leading to the left and right lobes

Bronchioles.

The branches in the lobes, air travels through

Aveoli

Lots of tiny air pockets surrounded by capillaries. Gas exchange happens here.

Order of digestive tract:

Mouth, Oesophagus, Stomach, Small Intestine, Large Intestine, Rectum

Mouth.

1)Mechanical: Grinds

2)Chemical: Saliva breaks down starches.

Stomach

1)Mechanical: Muscular Walls

2)Chemical: Gastric Juice kills bacteria and starts digestion of protein

Small Intestine, 1st Chamber

Duodenum, filled with bile from liver which breaks down fat, and pancreatic juice from the pancreas, which helps digest carbs, fats and proteins

Also mechanical

Cellular Respiration

Glucose + 0₂ => C0₂ + H₂0 + Energy (ATP)