Chapter 3 – Excretion 3.1 Human Excretion 1. The elimination of the metabolic waste products from the body is called ………………………….. This is done by the excretory organs. 2. Defecation is …………. excretion because faeces contain undigested food which has not been …………………………..into the cells or taken part in metabolism. 3. There are few parts of our body carried out the excretion process. a) Kidney - Kidneys are the …………………………………..in the excretory system. - Kidneys …………………… the blood and produce ……………………… - Urine is a yellowish liquid that contains ……………………, …………………………………….. and ………………. b) Skin - Skin has many ………………………………… which can produce sweat when the body is hot. - The sweat gland leads to a ………………………………….. which opens on the skin surface as a ………………………………….. - Sweat is extracted from the …………………………………….. surrounding the sweat glands. - Sweat contains ……………………….., ……………………………………… and …………………… c) Lungs - During cell respiration, the cells produce ………………………………….. and …………………….. as waste products. - Carbon dioxide diffuses out of the blood capillaries into the ……………………… - Carbon dioxide and water vapour are ……………………….. from lungs by ……………………… 4. The importance of excretion a. Disposal of ………………….. or ……………………….. wastes (exp: CO 2 , urea) b. Disposal of …………………………………………… (exp: salts, water) 5. Not all mammals sweat. For example: dogs, have sweat glands only on the …………….. of their paws and they cool themselves mainly by ………………………
Chapter 3 Excretion 3.1 Human Excretion 1. The elimination of
the metabolic waste products from the body is called .. This is
done by the excretory organs. 2. Defecation is . excretion because
faeces contain undigested food which has not been ..into the cells
or taken part in metabolism. 3. There are few parts of our body
carried out the excretion process. a) Kidney Kidneys are the ..in
the excretory system. Kidneys the blood and produce Urine is a
yellowish liquid that contains , .. and .b) Skin Skin has many
which can produce sweat when the body is hot. The sweat gland leads
to a .. which opens on the skin surface as a .. Sweat is extracted
from the .. surrounding the sweat glands. Sweat contains .., and c)
Lungs During cell respiration, the cells produce .. and .. as waste
products. Carbon dioxide diffuses out of the blood capillaries into
the Carbon dioxide and water vapour are .. from lungs by 4. The
importance of excretion a. Disposal of .. or .. wastes (exp: CO2,
urea)b. Disposal of (exp: salts, water) 5. Not all mammals sweat.
For example: dogs, have sweat glands only on the .. of their paws
and they cool themselves mainly by
Structure of human skin
3.2 The Urinary System in the Human BeingsThe kidney 1. kidneys
are the main excretory organs in our body.2. The structure of
kidneys is a pair of red-brown, bean-shaped organs. Each kidney is
about the size of a3. The kidneys are covered and protected by
thick layer of ..4. A longitudinal section of the kidney shows that
it is divided into region. The dark red outer region is called .
and the pale-red inner region is called .5. Each medulla is filled
with cone-shaped tissues called 6. The apices of the pyramids open
into a funnel shaped cavity called The pelvis drains urine into the
7. Each human kidney has at least one million tiny blood filters. .
is formed within these tiny blood filters. 8. The functions of
kidneys are:a. Remove .such as urea along with excess water and
mineral salts in the form of urine. b. Keep the .. and in our body
in balance. c. Control the amount of .. in the body fluid.d.
