Structures of the Excretory System

The Skin

� Sweat glands produce sweat, which

functions as a temperature control and

pheromone release

� Sweat also produces salt

Lungs

� The lungs diffuses gaseous wastes

-carbon dioxide

� The waste is diffused from the

bloodstream as a normal part of

respiration

Kidneys

� The kidney eliminates wastes from the

bloodstream by the production of urine

� Nephrons are the basic structural and

functional unit of the kidney

-There are over 1 million nephrons in

each kidney

-act as filters inside the kidneys

Ureter

� The ureters are muscular tubes that take

urine from the kidneys to the urinary

bladder

Urinary Bladder

� The urinary bladder collects urine created

by the kidneys

� The urinary bladder is located on the

pelvis floor

Urethra

� connects the urinary bladder to the

outside of the body. In humans.

Excretion and the KidneysExcretion is the process by which waste

products and other non-useful materials are eliminated from an organism.

When waste blood enters the kidney, urea and excess water are removed by units called nephrons.

Excretory in depth

� As your body performs the many functions

that it needs in order to keep itself alive, it

produces wastes. These wastes are

chemicals that are toxic and that if left

alone would seriously hurt or even kill you.

Continued…

� The excretory system is a biological system

that removes excess and unnecessary

materials from an organism, to help

prevent damage to the body.

Continued…

� The excretory system removes liquid toxic

wastes as well as excess water from the

organism, in the form of urine.

The Kidneys

and

HomeostasisThe Kidneys respond directly to the composition of the blood. They are also influenced by the endocrine system. Disruption of proper kidney function can lead to serious health problems.

Homeostasis

� Tendency of an organism or a cell to

regulate its internal conditions so as to

stabilize its health and functioning,

regardless of the outside changing

conditions.

Endocrine System

� System of glands that produce endocrine

secretions that help control bodily

metabolic activity.

Composition of Blood

� Blood is made up of red blood cells, white

blood cells, and platelets. The cells float in

a straw-colored liquid called blood

plasma.

Filtration

Shekinah & Dashawn

What is filtration?

� Passing a liquid or gas through a filter to

remove wastes. (a Filter)

Why is it used?� It’s a filter….

� Separate particles

� Break down things

How is it used in the excretory

system?

Where it occurs

� In the Kidneys where urine is made by filtering blood

What is filtered out

� Nitrogenous waste

� Nucleic acids

How filtration works

� Water and chemicals are squeezed through capillary walls as the heart pushes blood through the glomerulus

Different types of Filtration � Mechanical Filtration: Trapping of solids… � Biological Filtration: uses bacteria to breakdown waste..� Natural Filtration: Simplest filtration…records the “past behavior”� Water Filtration: to remove impurities from the water supplyAnd Many more!

Any

Questions?

?