Intake of raw materials

Question 1

Intake of Oxygen

Answer 1

• O2 = 21% of air
• carriers air between nose & lungs for breathing
• air goes - nasal cavity - pharynx - larynx - trachea - bronchi - avioli - capillaries (where gase exchange happens

Question 2

Ingestion of nutrients

Answer 2

• balanced diet
• substance absorbed from the gastrointestinal tract after digestion
• promote body function
• fuel energy
• building blocks for cell division
• tissue growth and cell division & tissue growth and repair
• Nutrient = water, carbs, proteins, fat, vitamins and mineral salts

Question 3

DIGESTION

Answer 3

• food is chemically complex
• function: break down or digest
• food so that it can be absorbed into circulation
• then used in the body cells

Question 4

ALIMENTARY CANAL

Answer 4

• a tube = 9cm long in adult
• beginning in the mouth - pharynx - oesophagus - stomach - small and large intestine - rectum - anus

Question 5

ACCESSORY ORGANS

Answer 5

• salivary glands (synthesis digestive enzyme)
• pancreas (synthesis digestive enzyme)
• liver

Question 6

METABOLISM

Answer 6

• chemical reactions continuous
• anabolism: building/synthesising large and complex substances
• Catabolism: breaking down substances to provide energy & raw materials for anabolism (substance for excretion as waste)
• sources of energy = carbs & fats