RESPIRATORY AND CIRCULATORY

SYSTEMSpp. 933-939 AND 946-950

Warm-up 5/12: Describe the difference between positive and negative feedback.

CIRCULATORY SYSTEM

• moves fluid throughout the body

STRUCTURES• Heart – muscular organ that pumps blood to all parts of the

body.

a. divided into right side and left side by septum

b. each side has an upper section (atrium) and

lower section (ventricle).

• Vessels: smooth muscle surrounded by connective tissue

a. arteries – carries blood from the heart

b. aorta –Largest artery.

c. veins –carries blood to the heart

d. capillaries –narrow blood vessels that pass

blood in single file.

MOVEMENT OF BLOOD

• right side: (deoxygenated) blood from body to heart to lungs

Body vena cavae rt. atrium rt. ventricle

pulm. arteries lungs

• left side: (oxygenated) blood from lungs to the heart to body.

Lungs Pulmonary veins lt. atrium lt.

ventricle aorta body

• when the heart contracts, blood is squeezed from right atrium right ventricle

• when heart contracts a 2nd time, blood in right ventricle is sent through blood vessels into lungs.

RESPIRATORY

EXTERNAL FUNCTION

• exchange of gases between atmosphere and blood

mouth/nose pharynx epiglottis trachea

bronchi lungs

MECHANISM

• Large skeletal muscle (diaphragm) contracts pulling lungs down causing them to fill with air

INTERNAL FUNCTION

• exchange of gases between blood and cells

• Gases diffuse across due to concentration gradients

lungs (alveoli) capillaries (carrying blood)

Homework

• Circulatory and Respiratory WS

• Turn in Notebook

Homework

• Read p. 933-939 AND 946-950

• Problems p 939 #1,3,4,6

• Read 946-950 Problems p 950 #1,3,4,6

Warm-up 4/19

• Draw a heart and a loop of Artery/Vein (Aorta/ Vena Cava) + Lungs– Label 4 chambers of heart. Show direction of

blood flow.

– Turn in Warm-ups in Bin

• You have 5 min.