This document discusses how animals survive through various body processes like digestion, respiration, circulation, and excretion. It focuses on these processes in humans. Digestion breaks down food for absorption in the gastrointestinal tract. Respiration is the exchange of gases in the respiratory system, which in humans occurs in the upper and lower respiratory tracts. Circulation transports nutrients and wastes via the closed circulatory system of heart, arteries, veins and capillaries. Excretion removes metabolic wastes through the skin, lungs, and kidneys in humans.

1. How animals survive

2. How animals survive-
Animals and humans
use various body
parts and their
mechanisms to carry
out the life process.

4. Digestion-It is the
process by which the
organs break down
food into forms that
their cell may absorb
and use.

5. Digestion in
Humans-The
digestive system is
also called
Gastrointestinal
tract.

7. Respiration- The
exchange of
respiratory gases
between the external
environment and the
organism’s body or cell.

8. Gas exchange in
Humans-In humans and
most mammals ,
exchange of gases
occurs in an organized
respiratory system.

9. The human respiratory
system is divided into
two sections. Upper
respiratory tract and
Lower respiratory
tract.

10. Upper respiratory
tract- Comprises the
nasal activity, Oral
activity, pharynx and
larynx.

11. Lower respiratory
tract-Is mainly
composed of the
trachea, bronchi, and a
pair of lungs.

12. Circulation- The materials
in the animals body is
very important. The main
function of circulation are
to transport nutrients,
oxygen and also to get rid
of the waste product of
the body cell.

13. Circulation in Humans-
Humans have closed
circulatory system which
includes the heart, arteries,
veins and capillaries. While
Blood, is composed of
plasma, red blood cells,
white blood cells and
platelets run through this
closed system.

14. Excretion- It is the
removal of metabolic
wastes, which
includes carbon
dioxide, water from
cell respiration and
nitrogenous wastes.

15. Excretion in Humans-
The excretion in
humans include the
skin, lungs and
kidneys.

16. The skin eliminates water in
the form of sweat. The lungs
expel carbon dioxide during
exhalation while the kidneys
function both as
osmoregulator that regulates
blood volume and its
concentration and as organ
for excretion waste.