Excretory System

What four systems are most involved in excreting (getting rid

of) wastes?

# 1 # 2 # 3

URINARY SYSTEM DIGESTIVE SYSTEM RESPIRATORY SYSTEM

# 4

INTEGUMENTARY SYSTEM

Excretory systems regulate the chemical composition of body fluids by removing wastes and retaining the

proper amounts of water, salts, and nutrients.

Not all organisms use the same routes or excrete their wastes the same way humans do.

# 1The Human Urinary System

Is made of:

2 Kidneys

2 Ureters

1 Bladder

1 Urethra

# 1The Human Urinary System

# 1The Human Urinary System

• Each kidney is made up of about one million tiny filters.

• Each filtering unit of the kidney is called a nephron.

• Blood entering a nephron carries wastes produced by body cells.

# 1The Human Urinary System

Click image to view movie.

• The kidneys are responsible for cleaning the blood by removing metabolic wastes, excess solutes, and excess water and excreting them as urine

• Besides removing urea, it also removes excess salts or glucose, the remnants of drugs (reason for urine tests), and excess water.

# 1The Human Urinary System

• You produce about 2 L of urine a day.

This waste fluid flows out of the kidneys, through the ureter, and into the urinary bladder, where it

may be stored.

# 1The Human Urinary System

# 2 The Digestive SystemReview

The Digestive System is responsible for taking the food

we eat and converting it to energy for our bodies to use.

What is not useable for the body is

released as solid waste.

# 3 The Respiratory System

What waste does your body get rid of during respiration?

# 4 The Integumentary SystemThe Integumentary System serves as a cushion, protection, a regulator, a sensory receptor, and

an EXCRETER OR WASTES.

It rids the body of access water and salt through sweat glands

Nephridia

IN COMPARISON:

Invertebrate

Some invertebrates, such as worms, use nephridia for excretory purposes.

It is a tubule that expels waste through a pore.

Most terrestrial arthropods (ex. Insects) excrete wastes through Malpighian tubules.

In insects, the tubules are all located in the abdomen rather than in each segment.

These are a set of long tubules that draw in excess body fluids- water is absorbed, and the rest of the wastes empty into the

gut, and then out of the insect.

Explain why the loss of function in your kidneys is dangerous.

Question 1

The kidneys filter waste products such as ammonia and urea out of the body. They also help control the sodium level in your blood and regulate the pH of blood. Without proper function of your kidneys, these waste products would poison the body.