Nutrition Flashcards
Define the term parasite and give an example (2)
- live in or one a host and obtain nutrient whilst harming the host
- tapeworm/ticks/leeches/headlice
Describe the terms autotroph and give an example (2)
- use simple inorganic molecules to synthesise organic compouns
- plant/algae
Describe the term saprophyte and give an example (2)
- secrete enzymes onto foood outside the body and absorb soluble products
- bacteria/fungi
Describe two features of an epithelium cell and explain why it is impotant for cell to function effieintly (4)
- microvilli
- increase surrface area for diffusion
- mitochondria
- synthesis of ATP for active transport
What is the function of goblet cells (1)
- secretes mucus
Where is the main regions in human gut where digestion and absorption occurs (2)
- digestion - mouth ,stomach,small intestine
- absorption - small intestine , large intestine
Explain why the human digestive system is divided into several regions (1)
- different parts carry out different functions
- provide differnt conditions for enzymes
- difference food groups digested in different areas
Suggest why it is a benefit for tapeworm to live in small intestine (1)
- region has hgih concentration of products of digestion
- tapeworm can absorb nutrients
- nourishment from digested food
How are tapeworms adapted overcome persitalsis and digestive enzymes (2)
- peristalsis - hooks and suckers attatch to gut wall
- digesive enzymes - thick cuticle/secretes muscus/secretes enzyme inhibitors
Suggest why tapeworms produce large number of eggs (1)
increases chance of surrvival / infeting a new host / many eggs will not survive
Which is the most acidic region of the alimetnary canal (1)
- stomach
In which two areas are proteins,carbohydrates and lipids digested together (1)
- duodenum
- ileum
Where does the process of protein digestion begin (1)
- stomach
Where is the main site of lipase production (1)
- pancreas
The setion of the alimentary canal where most absorption of digested products occur (1)
- ileum