Jan. 30, 2018 You need: Clean paper / Pencil Paper guts - digestive Warm Up: Mental Math Quiz – be ready I CAN: determine the parts/function of the excretory system

MRS NERG-C M - Movement R – Respirations S – Sensitivity (responds to stimulus) N – Nutrition / nutrients E - Excretion R – Reproduces G - Growth C - Cells

Body Organization Organism Organ System Organ Tissue Cell

How are cells organized? ORGANISM (BODY) Complex living things are organized into 5 levels. Cells carry on the processes that keep us alive. Examples: Red Blood Cells Muscle Cells Skin Cells ORGAN SYSTEM ORGANS TISSUES CELLS

Organs are organized into ORGAN SYSTEMS! An ORGAN SYSTEM is a group of organs that work together to perform a major job. Examples: Circulatory System Digestive System Skeletal System ORGAN SYSTEM ORGANS TISSUES CELLS

What is HOMEOSTASIS? HOMEOSTASIS is how your body maintains an INTERNAL BALANCE. It keeps your body STABLE in spite of changes OUTSIDE YOUR BODY.

The Digestive System Mouth Esophagus Stomach Liver Rectum Pancreas Gallbladder Small intestine Large intestine Rectum Pancreas

The Digestive System The digestive system has 3 main functions: It breaks down food into particles that the body can use. It absorbs nutrients into the blood. It eliminates waste from the body. Mouth Esophagus

The Digestive System Digestion can happen in two ways: Mechanical digestion: foods are physically broken down into smaller parts (like by teeth). Chemical digestion: Chemicals called ENZYMES break foods into their smaller “building blocks” (for example, starch gets broken down into sugar). Mouth Esophagus

We did not actually begin the excretory system today! Jan. 30, 2018

Excretory System Fluid’s

Main Function: The system of the body that collects waste produced by cells and removes the wastes from the body. (also known as: excretion)

Wastes Eliminated: It specifically removes Urea – chemicals that come from the break down of proteins Excess water Other wastes

The path of the excretory system Kidneys – filter blood Ureters – narrow tubes that leading from the kidneys to the bladder Urinary Bladder-fist sized pouch (muscular sac) that holds about 2 cups of urine Urethra – exit tube

The Kidneys and their Nephrons The kidneys are made of millions of nephrons, tiny filter factories. First, the wastes and the needed materials, like glucose and water, are filtered out of blood Second, the needed materials are returned to the blood and wastes are eliminated.

Nephrons Capillaries Capillaries Urea Check page 427 in the green book. Write out 1-5. Capillaries Capillaries Urea Urea, water, glucose, and other materials… water, glucose Kidney

After the reabsorbing process is complete, the liquid that remains in the tube is called… URINE.

What happens in the Nephrons? Just to review… Materials and wastes go through the tubes Protein, glucose, most water, and some other materials return to the blood Wastes and small amounts of water stay and are excreted

Analyzing signs of disease… Doctors will dip a strip of paper into urine to test for the presence of glucose and protein. The presence of Glucose = diabetes The presence of Protein = kidneys not functioning correctly

Homeostasis with Excretion Check in the book on page 428 first! Excretion maintains homeostasis by keeping the body’s internal environment stable and free of harmful levels of chemicals. Kidneys Lungs and Skin Liver

Homeostasis Kidneys Regulate amount of water in your body Hot day – you will sweat a lot, but you don’t drink a lot so you excrete small amounts of urine

Homeostasis Lungs and Skin Exhale carbon dioxide and water vapor Sweat water and urea Liver Breaks down wastes before excreting them

Excretory system Kidneys Ureters Bladder Urethra Blood vessels (in and out) Kidneys = bean shaped, made of millions of nephrons to filter, take trash and a little water, good stuff is kept Kidneys Ureters = two tubes…one from each kidney to the bladder Ureters Bladder = holding pouch for urine (waste products and water) Bladder Urethra Urethra = tube from bladder to the outside of the body.

Homework Review your excretory notes. Add a little color to the picture of the organs. Write your name on the back of the 6 rectangles that list the steps or process. Write the number on the front – showing which step you think it is (1 = first) Cut out the rectangles, but do NOT glue!

Demo LISTEN North-west pours South-west cleans All write out three sentence summary

Excretory PROCESS

Excretory PROCESS Now GLUE!

Schoolhouse Rock Digestion Circulatory

Circulation Notice the “right” and “left” Notice the colors – and WHEN they show each. Does the circulatory always stay in the heart?

Are there any questions?