Section 30-1Section 30-1“Respiratory & “Respiratory &

Circulatory Circulatory SystemsSystems””

Write everything that isWrite everything that is underlinedunderlined

30.1 Respiratory and Circulatory Functions

KEY CONCEPTKEY CONCEPT

The respiratory and circulatory The respiratory and circulatory systems bring oxygen and nutrients to systems bring oxygen and nutrients to the cellsthe cells

30.1 Respiratory and Circulatory Functions

I. The respiratory and circulatory systems work together to I. The respiratory and circulatory systems work together to maintain homeostasismaintain homeostasis

• The circulatory system The circulatory system transports blood and other transports blood and other materialsmaterials

–brings supplies to cellsbrings supplies to cells

–carries away wastescarries away wastes –separates oxygen-poor separates oxygen-poor

and oxygen-rich bloodand oxygen-rich blood

30.1 Respiratory and Circulatory Functions

nose

sinus

mouth

epiglottistrachea

lungs

• The respiratory system is where gas The respiratory system is where gas exchange occursexchange occurs–picks up oxygen from inhaled airpicks up oxygen from inhaled air

–expels (gets rid of) carbon dioxide expels (gets rid of) carbon dioxide and waterand water

30.1 Respiratory and Circulatory Functions

The respiratory system moves gases into The respiratory system moves gases into and out of the bloodand out of the blood

• The lungs contain the bronchi, bronchioles, and alveoliThe lungs contain the bronchi, bronchioles, and alveoli• Millions of alveoli give the lungs a huge surface areaMillions of alveoli give the lungs a huge surface area

• The alveoli absorb oxygen from the air The alveoli absorb oxygen from the air you inhaleyou inhale

alveolibronchiole

30.1 Respiratory and Circulatory Functions

• Breathing involves the diaphragm and muscles of Breathing involves the diaphragm and muscles of the rib cagethe rib cage

• Air flows from areas of high Air flows from areas of high pressure to low pressurepressure to low pressure

Air inhaled.

Muscles contract andrib cage expands.

Diaphragm flattensand moves downward.

Air exhaled.

Muscles andrib cage relax.

Diaphragm relaxesand rises.

30.1 Respiratory and Circulatory Functions

veins

arteries

II. The circulatory system moves blood to all II. The circulatory system moves blood to all parts of the bodyparts of the body

• The system includes the heart, The system includes the heart, arteries, veins, and capillariesarteries, veins, and capillaries

– heart pumps blood heart pumps blood throughout body throughout body

– arteries move blood away arteries move blood away from heart from heart ((AArtery rtery AAway)way)

– veins move blood back to veins move blood back to heartheart

– capillaries get blood to and capillaries get blood to and from the cellsfrom the cells

30.1 Respiratory and Circulatory Functions

• The respiratory system exchanges The respiratory system exchanges oxygen and carbon dioxide with oxygen and carbon dioxide with the blood inside the body and the the blood inside the body and the outside airoutside air

• The circulatory system moves that The circulatory system moves that blood around the body and back to blood around the body and back to the lungsthe lungs

• They are working togetherThey are working together