The excretory system removes waste from the body through excretion. The kidneys are key excretory organs that filter waste like carbon dioxide, water, and nitrogenous waste from the blood to produce urine. The urine passes from the kidneys through ureters to the urinary bladder, where it is temporarily stored before leaving the body through the urethra. The nephrons are the functional units of the kidneys that filter the blood and produce urine, consisting of a glomerulus surrounded by Bowman's capsule and tubules.
6. Functions of Excretion
1. To Regulate the chemical
makeup of the blood and
body fluids by removing
wastes and excess materials.
2. To maintain a constant body
temperature by removing
excess heat.
7. 3. To maintain the
homeostasis (internal
balance) together with
the circulatory, nervous
and endocrine system
8. Human Urinary System
The urinary system includes
the
- Kidneys,
- Ureter,
- Urinary bladder,
- Urethra.
9.
10. Functions of Kidneys
•They remove the wastes of
cellular metabolism from the
blood.
•They control the
concentrations of the various
substances found in the body
fluids.
16. Structure of Kidney
The kidney is divided into three
distinct regions.
•The outermost region is the
cortex,
•the middle region is the
medulla, and
•the inner region is the pelvis.
17.
18. The filtering of the blood
occurs in the cortex;
The medulla consists of
collecting ducts that carry the
urine; and
The pelvis is a cavity
connected to the ureter, into
which the urine drains
19.
20. Structure of Nephron
•The functional units of the
kidneys are the nephrons.
•A cluster of Blood capillaries,
the glomerulus,
•It is surrounded by
Bowman's capsule.