nervous system

Question 1

how does the nervous system work?

Answer 1

messages transmits to neurons via electrical and chemical impulses sent from the pheriferal parts if the body to internal ins resulting in a reaction.

Question 2

what are the three types of neutrons?

Answer 2

sensory
relay
motor

Question 3

what do neutrons communicate through?

Answer 3

synaptic gaps

Question 4

what do sensory neurone do?

Answer 4

transmits impulses rom the receptors in the sense organs e.g eyes, skin, to the brain

Question 5

what do relay neutrons do?

Answer 5

transmits nerve impulses from the sensory neuron’s to the motor neuron located in the CNS

Question 6

what do all neurone contain?

Answer 6

axon
cell body
dendrites

Question 7

describe what myelinated means?

Answer 7

it means having a myelin sheath

Question 8

what is basal surface?

Answer 8

bottom edge of the cell or tissue adjacent to the basement membrane

Question 9

what is apical surface?

Answer 9

the top edge of the cell or tissue outwards facing

Question 10

what is connective tissue made up from?

Answer 10

extracullar matrix
cells
fibres

Question 11

describe the shape of a cuboidal cell?

Answer 11

spherical nucleus

Question 12

what two things does the CNS contain?

Answer 12

brain and spinal cord

Question 13

what is the peripheral nervous system?

Answer 13

outside of the body example such as blinking

Question 14

what is somatic and autonomic?

Answer 14

voluntary and involuntary

Question 15

what is the sympathetic nervous system?

Answer 15

fight or flight instincts increase bp and hr and also dilated pupils

Question 16

what is the parasympathetic nervous system?

Answer 16

relaxation and sleeping decrease in bp and hr and constricted pupils

Question 17

what does lymph do?

Answer 17

maintain temperature
regulates white blood cells
maintains homeostasis

Question 18

what is unmelinated?

Answer 18

heat/cold detection and mechanical movement

Question 19

what is myelinated?

Answer 19

insulating material on neutrons cells in CNS which means quicker impulses

Question 20

what do valves do?

Answer 20

stops blood from moving in the wrong direction or backwards

Question 21

what are some advantages of the double circulatory system?

Answer 21

ability for more pressure
higher blood pressure therefore there is a greater Flow to tissues
the separation of oxygenated and deoxygenated blood

Question 22

features of arteries?

Answer 22

thicker walls
small lumen
thicker layer of muscles

Question 23

features of veins?

Answer 23

thin layers of muscles and elastic fibres
large lumen
fairly thin outer wall
have valves

Question 24

features and job of capillaries?

Answer 24

brings blood away from the heart there is also endothelial cells inside the capillaries and they also don’t have valves

Question 25

function of the vena cava?

Answer 25

brings deoxygenated blood to the heart to get oxygen and is composed of collagen and elastic fibres and connective tissue

Question 26

function of the aorta?

Answer 26

carries oxygenated blood from the heart around the body and is a cane shaped artery

Question 27

what is the structure and function of platelets?

Answer 27

platelets are colourless, small fragments of cells and there function is homeostasis as it controls bleeding and creates scabs

Question 28

structure and function of plasma?

Answer 28

it helps remove waste from cellular functions ad it also helps maintain body temp