unit 2 Flashcards
Muscle action in the peristalsis
Contract behind the food
Relax in front of food
Relaxed
Contracted
Features of the villi
Thin wall (one cell thick)- allowed dissolved molecules to pass through by rapid diffusion
Branching blood capillaries present - good blood supply to receive and transport absorbed glucose and amino acids
Central lateral present ensures that products of fat digestion can be passed to the lymph system
Digestive system
Tongue Salivary glands Oesophagus Liver Stomach Pancreas Duodenum Colon Ileum Rectum Anus
Lungs
Trachea (wind pipe)
Ring of Cartilage
Bronchus
Bronchioles
Lining of the trachea (wind pipe)
Cilia
Cilia cell
Secreted mucus
Mucus secreting cells
What do the Trachea and bronchi C-shaped cartilage do?
Keep airways open
Main food groups
Fats Proteins Vitamins Minerals Carbohydrates
Need for digestion
To break down large insoluble food molecules into smaller, soluble molecules by enzymes
Describe the Villi structure
Blood capillaries Lateral (tiny lymph vessel) Epithelium Lymph to lymphatic system Blood to vein Blood from artery
How is Glucose and amino-acids are absorbed by the villi ?
Taken directly into blood capillaries
How is fat digested by the villi?
Taken directly into the lateral
How is the products of fat digestion transported around the body ?
Carried in the lymphatic system
Features of the alveolus
Thin wall
Good blood supply
Large surface area
Moist surface
