Respiratory and Circulatory Functions

Sections 30.1 – 30.2

1

2

Circulatory and Respiratory Systems

They work together to help maintain homeostasis in the body.What do they help to regulate?

•Body temp•Heart rate•Breathing rate•O2 and CO2 levels in cells

3

Function of Respiratory and Circulatory SystemsMain job of Respiratory System

•Transport gases to and from the circulatory system

What gases?

•Get oxygen (O2) into the body and remove waste gases (CO2) out of the body

Main job of Circulatory System •Moves blood to all parts of the body.•Get oxygen (O2) into the body and remove waste gases (CO2) out of the body

These systems work together!

Respiratory and Circulatory Systems

•Components of Respiratory

NoseMouthSinus

TracheaLungs

Diaphragm

4

Components of Circulatory◦Heart◦Blood◦Blood Vessels

Arteries Veins Capillaries

5

RESPIRATORY SYSTEM

6

Pathway of Air into the Body

•Nose and Mouth-external opening to allow entry

•Air is filtered, cleaned, warmed, moistened

•Enters a series of tubes •Protected by cartilage to keep tubes firm/open•Mucus--traps foreign particles•Cilia-- “sweep” foreign material away from lungs to be swallowed (or spit/coughed)

Structure of Alveoli

7

• Small air sacs covered in mucus.• Wrapped in tiny blood vessels called capillaries

8

Respiratory System = system of tubes

•Trachea--main passageway to lungs•Bronchi--two branches off the trachea that lead to lungs•Bronchioles--smaller branches of the bronchi that lead to alveoli•Alveoli--small air sacs at end of bronchioles

•300 to 600 million in a pair of lungs•Great deal of surface area•Actual site of gas exchange

9

Breathing Mechanisms•Involves muscles of the rib cage and the diaphragm•Diaphragm: dome shaped muscle at the base of the rib cage

•Inhale: muscles contract, expand rib cage, diaphragm moves down•Exhale: muscles relax, contract rib cage, diaphragm moves up

Breathing Mechanisms

10

Air exhaled

Rib cage lowers

Diaphragm

Exhalation

Air inhaled

Rib cage rises

Diaphragm

Inhalation

11

Gas Exchange•3 principles for gas exchange:

•O2 and CO2 are carried by the blood•Gas moves by diffusion (moves from area of high to low concentration)•Lining of the alveoli must be moist to help gases diffuse

12

Diffusion of gases•Gases always move from areas of high concentration to areas of low concentration •O2 concentration is higher in alveoli than blood: oxygen diffuses into blood•At body cells O2 concentration is higher in blood: oxygen diffuses out of blood and into cells

Gas Exchange

13

Oxygen alveoli capillaries red blood cells

Carbon Dioxide red blood cells capillaries alveoli

14

Oxygen/Carbon Dioxide Transport

•O2 diffuses from alveoli to capillaries.

•O2 rich blood travels to heart and pumped to the body•In tissues, O2 levels are lower, so RBCs release O2 to cells.•In tissues, CO2 levels are higher, so CO2 diffuses from cells to blood. •CO2 travels in blood to heart in form of Bicarbonate ions (HCO3-)

•Heart pumps blood to lungs where HCO3- breaks down to CO2 and water and then expelled out of body.

15

Circulatory System in detailSections 30.3 – 30.5

16

Circulatory System Functions•Carry O2 to cells and CO2 away from cells

•Deliver nutrients through body (after absorption in small intestine)•Carry wastes away from cells (H2O, salt, urea)•Help in fighting infections•Temperature regulation

17

Parts of Circulatory System

•Heart: muscular pump that keeps blood moving throughout the system•Blood: contains fluids, red blood cells, white blood cells, and platelets•Blood vessels: carry blood to all of the body cells

18

Types of Blood Vessels•Arteries: carry blood away from heart •Veins: carry blood back to heart•Capillaries: tiny blood vessels that deliver O2/remove CO2 from body cells

19

The Heart•The heart is a muscular pump containing 4 chambers•Made of special cardiac muscle that does not tire, unlike other muscles•2 smaller chambers at the top called atria (singular atrium)•2 larger chamber at the bottom called ventricles•There are valves separating all of the chamber that prevent backflow

Chambers of the Heart

20

21

The Heartbeat•Consists of 2 contractions•Sinoatrial (SA) node sends electrical signal, which causes both of the atria to contract•Electric signal spreads to the atrioventricular (AV) node•AV node stimulates both ventricles to contract

Blood flow through the heart

1. Into vena cava2. Into right atrium3. Down to right ventricle4. Out pulmonary artery to lungs

¨ Gets O2 and dumps CO2

5. Back to heart through pulmonary vein6. Into left atrium7. Down to left ventricle8. Out aorta to body

22

24

Two main circuits•Pulmonary

• Blood goes from heart to lungs to pick up oxygen and release

carbon dioxide•Systemic

• Blood pumped out of heart to the rest of the

body• Sound of heart (lub/dub)

made by valves closing

25

Blood flow through the body

•Blood vessels•Arteries--take oxygenated blood away

from the heart•Thick/muscular

and flexible walls

•Do not contain valves

•High Pressure

26

Blood flow through the body

•Capillaries•Very small vessels

•Gases diffuse across very thin wall of

small vessels•Nutrients and oxygen leave the blood and

go into the body tissue

27

Blood flow through the body

•Blood vessels•Veins--take

deoxygenated blood back to the

heart•Thin walls

•Larger diameters than arteries

•Have one-way valves

•Low Pressure

28

Blood flow through rest of body

29

Circulation and Blood Pressure•Blood Pressure: the forces with which blood pushes against the wall of an artery•Healthy BP is 120/70

• Systolic is top number, when the left ventricle contracts

•Diastolic is bottom number, when the left ventricle relaxes

•What could cause high BP?• Blocked arteries

• Less elastic arteries• Stress, high activity

30

Function: Delivery of nutrients and removal of wastes•Blood delivers O2 to cells

•Delivers nutrients from digestion to cells (sugars, proteins)•Blood takes CO2 back to lungs

•Delivers salts, water, and nitrogenous wastes (urea) to the kidneys for excretion

•Urea•Main nitrogenous waste of body

•Produced in liver (from ammonia--NH3)

•Removed by kidneys

31

Function: Homeostasis (Maintain Temperature)•In cold environments, blood vessels constrict in extremities to keep the torso and brain warm.•In hot environments, blood vessels dilate and release excess heat.

32

Function: Homeostasis (Maintain Oxygen Levels)•When cells need more oxygen, sensors in the walls of major arteries send signals to brain stem (medulla)•Medulla coordinates with respiratory and circulatory systems to increase oxygen flow to cells and maintain homeostasis

Blood Lab

33

34

Components of Blood•Blood contents

•Plasma•90% Water•Nutrients, Proteins•Wastes, Dissolved CO2

•Cells•Red blood cells (erythrocytes)

•Made in bone marrow•25 trillion of them (1000 RBC:1 WBC)•Carry O2 and CO2

attached to protein called hemoglobin

•White blood cells (leukocytes)•fight infection•About 0.1% of all blood cells

•Platelets--involved in the formation of clots (along with fibrinogen (protein in blood) and blood cells)

ABO BasicsBlood group antigens are actually

sugars attached to the red blood cell.

Antigens are “built” onto the red blood cell.

Individuals inherit a gene which codes for specific sugar(s) to be added to the red cell.

The type of sugar added determines the blood group.

If you need blood, you must get the same blood type or something compatible.

Incompatible blood will cause an immune response that can block vessels and could cause death.

36

ABO Blood Types•Four blood types: A, B, AB, & O•O has no protein markers•A has A protein markers•B has B protein markers•AB has A and B protein markers

ABO Basics

The immune system produces an antibody (protein) in the plasma (produced by white blood cells) for the antigen not present.

Antibodies recognize foreigners and destroy them. Antibody B destroys antigen B.

For example, blood type A has antigen A attached to the red blood cell and antibody B in their plasma. Therefore, if blood type B is injected into their systems, anti-B antibodies in their plasma will recognize it as an alien and destroy it.

http://upload.wikimedia.org/wikipedia/commons/3/32/ABO_blood_type.svg

Rh FactorAnother important antigen

(antigen D) found on the surface of red blood cells (RBCs) is the Rh factor.

Blood containing this antigen is said to be Rh positive (Rh+); blood lacking this antigen is said to be Rh negative (Rh-).

Positive can receive + or – bloodNegative can only receive – blood

Rh Disease of the Neborn – How it Occurs

A) child is Rh + and mother is Rh - B) during pregnancy fetal Rh + rbc’s escape into maternal circulation C) This causes the mother's immune system to make antibodies against

the baby's red blood cells Rh (D) in future pregnancies. D) Second pregnancy with Rh (D) pos child results in destruction of fetal D

pos rbcs This antibody response is called Rh sensitization and, depending on when it

happens, can destroy the red blood cells of the baby before or after it is born.

If sensitization happens, a fetus or newborn can develop mild to severe problems (called Rh disease). In rare cases, if Rh disease is not treated, the fetus or newborn may die.

A woman with Rh-negative blood can get a shot of Rh immunoglobulin (such as RhoGAM) that almost always stops sensitization from occurring. Problems from Rh sensitization have become very rare since Rh immunoglobulin was developed.

Hemolysis•If an individual is transfused with an incompatible blood group destruction of the red blood cells will occur.•This may result in the death of the recipient.

ClumpingIf a film remains uniform in

appearance, there is no agglutination (clumping).

If the sample appears granular, agglutination has occurred.

When does the blood react?Blood reacting to anti-A is group

A. Blood reacting to anti-B is group

B.Blood reacting to both anti-A and

anti-B is group AB.Blood not reacting to either anti-

A or anti-B is group O. Blood reacting to anti-Rh (D) is

Rh+; Blood not reacting to anti-Rh (D) is Rh-

45

Blood TransfusionsBlood must match for both ABO and Rh factorWhat type(s) of blood can AB- receive?What type(s) of blood can B+ receive?What type(s) of blood can O- receive?

How common is your blood type?

46.1%

38.8%

11.1%

3.9%

Blood Transfusion

Type You Can Give Blood To

You Can Receive Blood From

A A,  AB A, O

O ALL O

B B,  AB B,  O

AB AB ALL

TYPE YOU CAN GIVE BLOOD TO

YOU CAN RECEIVE BLOOD FROM

Rh + + + or -Rh - - -

With Rh-/Rh+

Type You Can Give Blood To

You Can Receive Blood From

A+ A+  AB+ A+  A-  O+  O-

O+ O+  A+  B+  AB+ O+  O-

B+ B+  AB+ B+  B-  O+  O-

AB+ AB+ Everyone

A- A+  A-  AB+  AB- A-  O-

O- Everyone O-

B- B+  B-  AB+  AB- B-  O-

AB- AB+  AB- AB-  A-  B-  O-