week 2 Flashcards
1
Q
What is a prokaryotic cell?
A
- unicellular
- no membrane
- asexual reproduction
- no nucleus or cytoskeleton
- small
2
Q
What is a eukaryotic cell?
A
- multicellular
- have membranes and nucleus
- sexual reproduction
- large
3
Q
What is a virus?
A
- non-living
- no cellular structure
- can mutate
4
Q
What is bacteria?
A
- prokaryote
- unicellular
- cell wall present
5
Q
Selectively permeable meaning…
A
Selectively permeable membranes allow the passage of some molecules or ions to inhibit the passage of others
6
Q
Define diffusion
A
Diffusion is the movement of a substance from a region of higher concentration to a region of lower concentration.
7
Q
What is the chain of infection?
A
Infectious agent, reservoir, portal of entry, mode of transmission, portal of exit, susceptible host
8
Q
What are the layers of the integumentary system (skin)?
A
- epidermis
- dermis
- hypodermis
9
Q
Define osmosis
A
The movement of water across a semi-permeable membrane
10
Q
What is the 1st line of defence?
A
- non-specific
- skin, mucous membranes, fluids, vomiting etc.
11
Q
What is the 2nd line of defence?
A
- non-specific
- invaders attacked in SAME way
- antimicrobial chemicals
- phagocytes
- natural killer cells
- inflammation
- fever
12
Q
What is the 3rd line of defence?
A
- specific
- B & T cells
- B cells make antibodies
- T cells kill abnormal cells directly
13
Q
What does the lymphatic system do?
A
- drains excess fluids + proteins
- defends body from internal + external factors
- transports fats and vitamins from gut to liver
