homosteis

Question 1

what happens on a hot day when your excreting

Answer 1

you will produce less urine but this will be more concentrated
you will also lose more water through your breath when you exercise because you breathe faster

Question 2

what happens on a cold day when your not doing much

Answer 2

you don’t sweat much so you’ll produce more urine which will be pale

Question 3

what is homeostasis

Answer 3

the maintenance of a constant internal environment

Question 4

body temperature homeostasis

Answer 4

All enzymes work best at 37 degrees so body tries keeping that temp
A part of the brain receives messages from temperature receptors in the skin that provide information about skin temperature
Based on signals the CNS can activate the necessary effectors to make the body temperature stay right

Question 5

what is vasodilation

Answer 5

lots of sweat is produced when it evaporates it transfers energy from your skin to the environment so your cooler
blood vessels close to the surface widen
it allows more blood to flow near the surface so it can transfer more
hairs lie flat

Question 6

what is vasoconstrictions

Answer 6

very little sweat produced
blood vessels near the surface of the skin constrict so less blood flows near the surface so less energy is transferred to the surroundings
hairs stand on end to trap an insulating layer of air
you shiver it increase rate of respiration making you warmer by transferring energy

Question 7

do smaller or bigger organism cool down quicker

Answer 7

smaller organism

Question 8

why do smaller organisms cool down quicker

Answer 8

have bigger surface are to volume ratio

can gain or lose heat after as there is a greater area for the heat to transfer across

Question 9

why is small organisms losing body heat dangerous

Answer 9

they lose body heat more easily in hot conditions reducing chances of overheating but means they are vulnerable in cold environments

Question 10

what controls the gowth at the tips id shoots and roots

Answer 10

auxins

Question 11

how do auxins move through the plants

Answer 11

in solution

Question 12

what are shoots that grow towards the light

Answer 12

positively phototropic

Question 13

why does the soot bend towards the light

Answer 13

because the shoot tip us exposed to light so it accumulates more auxins on the side that’s in the shade so it grows faster on the shaded side

Question 14

what are negativist geotropic shoots

Answer 14

grow away from gravity

Question 15

why does the shoot bend upwards

Answer 15

because more auxins are produced on the lower side causing that side to grow faster

Question 16

what direction foes a shoot that’s geotropic grow in

Answer 16

it grows sideways

Question 17

roots that are positively grotropic grow where

Answer 17

grow towards gravity

Question 18

what direction do roots bend in

Answer 18

downwards

Question 19

why do roots grown downwards

Answer 19

it has more auxins on its lower side but in a root extra auxin inhibits growth so the cells on top elongate faster a

Question 20

what does extra auxins mean in the roots

Answer 20

it inhibits growth

Question 21

what is the word for roots that grow away form the light

Answer 21

negativity phototropic

Question 22

what happens when a root starts being exposed to some light

Answer 22

more auxin accumales on the more shaded side so the root bends downwards

Question 23

what happens if roots aren’t exposed to light

Answer 23

they grow downwards due to positive gravitropism