a ' Diffusion of Carbon (IV) Oxide; and
oxygen; through stomata and lenticels;
Some wastes are stored in tissues in non-
toxic form e.g. calcium oxalate;
Some of these tissues or organs drop off
from plants e.g. leaves,flowers, fruits and
bark of caffeine, nicotine, quinine;
Some wastes are released by transpiration
through stomata and lenticels such as water
vapour;
Others are released by guttation through
hydathodes as water;
Others are released by exudation. (max 4
marks)
When body temperature is lowered below
normal;
arterioles in the skin constrict;
blood is diverted to a shunt system;
less blood ?ows to the skin/less heat is lost;
when body temperature is raised above
normal;
arterioles in the skin dilate;
more blood ?ows to the skin;
more heat is lost by convection and
radiation;
when body temperature is lowered below
normal:
erector-pilli muscles contract, hair stands
erect;
more air is trapped, air is a bad conductor;
and insulates the body against heat loss;
when body temperature is raised above
normal:
erector-pilli muscles relax, hair lies on skin;
less air is trapped, more heat is lost;
when body temperature is lowered below
normal:
less fluids are absorbed by sweat glands;
less sweating, less vaporisation of water;
when body temperature is raised above
normal:
sweat glands are more stimulated and more
sweat is produced;
water in sweat evaporates and takes up heat
from the body;
body is cooled/body temperature is lowered;
alexis sadro answered the question on October 11, 2017 at 15:46
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