PowerPoint Presentation - Digestive/Excretory System

Digestive/Excretory System

Life Science Unit 3 Lesson 6

Attendance link: http://goo.gl/forms/42Y0JINUAL

Objectives

Describe the functions of organs and other structures in the digestive and excretory systems.

Compare the digestive and excretory systems of animals and plants.

Describe the function of the digestive and excretory systems in organisms.

Identify the structure of the digestive and excretory systems and organs within these systems.

Parts of the Digestive System

MouthPharynxEsophagus stomach small intestine large intestine Colon-rectumanus

Accessory Parts

Accessory OrgansSalivary GlandsPancreasLiver and Gallbladder

Process--Mouth

Food enters the mouth (mechanical digestion)Teeth grind, tear and chop foodSaliva moistens itAmylase begins to break down carbs in

foodSoft mass of chewed food--BOLUS

Swallowing

Swallowing--muscles in the tongue and mouth push food into…..

Esophagus--epiglottis keeps most food out of the windpipe

Connects to the stomach at the pyloric valvePeristalsis forces food into stomach

Stomach

Stomach--churns and mixes food with acids and enzymes

Three mechanical/chemical tasksStorageMix food, liquid and digestive juices

Soup like mass called CHYME

Empty contents slowly into small intestine

Do all animals have a stomach?

NoWhat do birds have to help them

break down food?It is a gizzard.

Small Intestine

Pyloric sphincter allows chyme into duodenumBile from pancreas addedDigestion continues Absorption begins

Villi--finger like projections

Role of Accessory Organs

Liver--produces bile to help absorb fat; processes nutrients

Gallbladder--stores bilePancreas--produces enzymes;

neutralizes stomach acids

Large Intestine

Main function--remove water from undigested matter and form solid wastes

Colon--solid wastes are stored until expelled through the rectum

What best describes the function of the digestive system?

The function of the digestive system is to break down food into nutrients.

Incomplete vs complete digestive systems

IncompleteTakes place in a

saclike cavity with a single opening.

Any food not digestive gets pushed back out through the same opening.

CompleteTakes place in a

series of tubes. With one entrance and one exit.

Undigested food is expelled in this one-way flow.

For both incomplete and complete digestive system…

Digestion begins outside the cells.

Code word:

Urea

Urinary System

Contains organs that remove waste products from your blood

Three body systems have a role in excretion: integumentary, respiratory, and finally the urinary system.

Kidneys

Located on either side of backboneFilters waste from other body

systemsMakes sugar available as fuel and

sends it to tissuesRemoves toxic chemicals in the

bloodstream

Kidneys

Blood circulates collecting wasteEnters kidneysReaches NEPHRONS--filtering units

Remove excess water, salt and urea from bloodMaterial left in nephron is urinePasses into 2 tubes called URETERS which

connect to urinary bladderUrine passes through URETHRA--and out

Urinary System Problems

Bacterial infections: infections can get into the bladder, and cause painful infections

Kidney stones: salts and wastes collect inside the kidneys and form kidney stones

Urinary System Problems

Kidney disease: damage to nephrons prevent normal kidney functioning, a person will end up on dialysis to help filter the blood.

Which of the two organs below are part of the excretory system?

A. Gizzard, beakB. Stomach, esophagusC. Large intestine, small intestineD. Kidney, bladder

What is the name of the organ that is responsible for storing urine?

Bladder

Assessment

OLS Online assessment 6 questionsOffline assessment 1 question

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