Unit 2

Unit 2Lesson 2Ho do the Circulatory and Respiratory Syste s w rk toget er?Big Idea

Heart Rate

Class BPM: __________

Field BPM: ___________LowerHigher3California StandardsScience Standard 2.b: Blood circulates through the heart chambers, lungs, and body and carbon dioxide (CO2) and oxygen (O2) are exchanged in the lungs and tissues.California StandardsInvestigation and ExperimentationInvestigation and Experimentation6.c Plan and conduct a simple investigation based on a student developed question and write instructions others can follow to carry out the procedure.6.d - Identify the dependent and controlled variables in an investigation.InputCirculatory system The body system that transports blood loaded with oxygen and nutrients to each cell of the body.Respiratory system The body system that exchanges oxygen and carbon dioxide between your body and the environment.

InputThe Heart (Pg. 156)The heart is the pumping organ of the body.Some animals hearts are very simple and some are very complex.An earthworms heart is just a muscular part of a large blood vessel.A crayfishs heart has two chambersA human heart is a double pump made up of four chambers

Input

InputBefore your heart beats, two chambers fill with blood.The heart pumps this blood throughout the body creating a pulse.Blood travels in a certain path.

Blood PathBlood from the right side of the body returns to the heart.The heart then pumps to the lungs.Carbon dioxide is exchanged for oxygen.Blood is then pumped to the left side of the heart.Then it is pumped to the entire body.Input

The Circulatory System (Pg. 158)It transports blood loaded with oxygen to the cells and takes away waste from the cells.It is made up of the heart, blood vessels, and blood (with help from the lungs).Input

InputBlood is connective tissue:Plasma (liquid) is mostly water and carries dissolved food and wasteRed blood cells (solid) carry oxygenWhite blood cells (solid) help fight infectionPlatelets (solid) help clot the blood to stop bleeding.

Blood leaves the heart and travels through arteries.Arteries bring the blood to small vessels called capillaries.Here materials exchange between the blood and body cells.Capillaries have thin walls and touch every body cell.Input

Materials cross through the walls of the capillaries and through the membranes of the cells.Capillaries then bring the old blood to large vessels called veins which return to the heart.

Input

The Respiratory System (Pg. 160)This system exchanges oxygen and carbon dioxide CO2 is harmful waste that lungs breathe out.Your diaphragm is a muscle below your ribs that helps pull in air.Air flows in and travels down tubes to the lungs.The tubes end in tiny sacs in the air.Input

Working Together (Pg. 162)Respiratory system brings air into the body.Oxygen passes from sacs in the lungs to the capillaries and into the bloodstream.Both systems are needed to do the job the body needs.Input

SummaryIn this lesson, you learned how the circulatory system and the respiratory system work together. They carry materials in the body and exchange gasses in the lungs.Unanswered QuestionsHow does smoking affect the way the respiratory and circulatory system work?Why do you feel like you cannot breathe when you get the wind knocked out of you?Ask your own

Where would you expect to see the most cases of Respiratory disease? The least?

Modeling1) Where does gas exchange take place in the body?

It takes place in tiny air sacs in the lungs.ModelingWhat are the four chambers in the heart?

Right and left atrium and the right and left ventricle.Check for understandingWhat carries blood away from the heart?

Arteries

Check for understandingWhat is the name of the muscle that helps pull air into your body?

Diaphragm

Complete #A1, #B1 and #B4 on page 59.Guided PracticeIndependent PracticeFinish the worksheet.

27HomeworkWorksheet Pg. 61-62