L1 - Cell Structure

Question 1

what are cells made up of?

Answer 1

organelles & cytoplasm

Question 2

what surrounds the cell?

Answer 2

extracellular fluid

Question 3

what marks the boundary between intracell and extracell?

Answer 3

plasma membrane (selectively permeable)

Question 4

through where do ions enter and exit the cell?

Answer 4

via ion channels embedded in the plasma membrane

Question 5

through where does water enter and exit the cell?

Answer 5

aquaporins

Question 6

what are the three types of movement in the cell?

Answer 6

1. diffusion
2. facilitated diffusion
3. active transport

Question 7

what percent of the body is water?

Answer 7

50-60%

Question 8

how is the water distributed?

Answer 8

1/3 in extracellular fluid and 2/3 in intracellular fluid

Question 9

what is the function of the nervous system?

Answer 9

monitor the internal and external environment of the body - detecting changes via sensory receptors

Question 10

how does the nervous system carry out its regulatory function?

Answer 10

the neurones’ ability to generate action potentials

Question 11

what are the three types of neurones?

Answer 11

sensory, motor and interneurone

Question 12

are neurones myelinated?

Answer 12

they can be either

Question 13

what is the function of a neurone?

Answer 13

to transmit information around the body - by generating an electrical signal called an action potential