CO-ORDINATION + RESPONSE IN HUMANS Flashcards Preview

A.Biology > CO-ORDINATION + RESPONSE IN HUMANS > Flashcards

Flashcards in CO-ORDINATION + RESPONSE IN HUMANS Deck (20):
1

how do organisms respond to change in the environment

1.STIMULUS-internal or external change
2.RECEPTORS-sense organs
3.CO-ORDINATORS-brain
4.EFFECTOR-muscle or gland
5.RESPONSE-action taken

2

what does HOMEOSTASIS control

1.TEMPERATURE-too hot (enzymes control things like respiration)
2.WATER CONTENT- to much (blood is dilute) to little (blood is constentrated

3

1.STIMULUS-hight temperature

2.RECEPTORS-skin
3.CO-ORDINATORS-brain
4.EFFECTORS-sweat gland
5.RESPONSE-sweating

4

VASODILATION-hot weather

1.muscle cells in the arterioles (small ateries) relax
-this causes dilation of blood vessels
*they get wider
*more blood flows through capillaries
*more heat can be lost by radiation
*red skin

5

VASOCONSTRICTION-cold weather

1.muscle cells in the arterioles (small ateries) contract
-this causes constriction of blood vessels
*they get narrower
*less blood flows through capillaries
*less heat can be lost by radiation
*pale skin

6

sense organs

see
touch
taste
hear
smell

7

Hormonal system

-slow responses
-long-lasting
-GLANDULAR cells that makes hormones
-hormones transported in the blood

8

Nervous system

-fast response
-short-lasting
-Nerve cells involved
-electrical impules go along nerves

9

CENTRAL NERVOUS SYSTEM (CNS)

made of brain and spinal cord and is linked to sense organsby nerves.

10

3 types of NEURONES

SENSORY-take messages from receptors
RELAY-transfere messages from sensory neurons to other nerve cells
MOTOR-take messages from CNS to effectors (e.g muscles or glands)

11

1. neurotransmitter diffuses across the synapase
2.nerve impules travels along a neurone
3.at the end of the neurone vesictes of neurotransmitter join the cell membrane
4.neurotransmitter triggers an impules in the next neurone

2.
3.
1.
4.

12

role of the neurotransmitters at synapses

it makes sure that nerve impules can only travel in one direction along a nerve pathway

13

EYE distant objects

-Ciliary muscles relax
-suspensory ligament pulled tight
-lens pulled thin

14

EYE nearby objects

-ciliary muscles contact
-suspensory ligaments slackened
-lens allowed to bulge

15

in darkness

-pupil gets bigger (dilates)
-circular muscles in the iris relax
-radial muscles in the iris contract
-iris pulls open the pupil

16

in bright light

-pupil gets smaller (constricts)
-circular muscles in the iris contract
-radial muscles in the iris relax
-iris makes the pupil smaller

17

ADRENALINE

ADRENAL GLAND
makes heart beat faster

18

INSULIN

PANCREAS
causes liver and muscles take glucose and restores blood level to normal

19

TESTOSTERONE

TESTES
development of male sex organs

20

OESTROGEN
PROGESTRONE

OVARIES
development of sex organs, lining of uterus to get thick and sponge
maintains lining of uterus