receptors

Question 1

receptor

Answer 1

detects change in internal and external environment (osmo,thermo,chemo, touch and pain)

Question 2

thermoreceptors

Answer 2

hot OR cold
in the skin: sensitive nerve ending, messages hypothalamus and cerebrum
internally: blood temperature monitored

Question 3

osmoreceptors

Answer 3

Hypothalamus
osmotic pressure: concentration of substances dissolved in water blood plasma
Stimulate hypothalamus to maintain water content

Question 4

chemoreceptors

Answer 4

stimulated by particular chemical
nose: sensitive to odours mouth: sensitive to taste
Internal composition of body fluids (pH, concentration of O2 and CO2, heartbeat and breathing)

Question 5

touch

Answer 5

skin -> surface sensitive to light touch, greater concentration are more sensitive areas
Hair follicle ->nerve endings at base of each follicle, responds to light touch
Adapts rapidly

Question 6

Nociceptors

Answer 6

Stimulated by damage to tissues
takes evasive action or seek medical attention
Pain continues until stimulus is gone
*highly concentrated in skin and mucous membranes, close to surface for increased speed of reaction and greater protection