RESPIRATORY AND CIRCULATORY SYSTEMS pp AND 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 AND Problems p 939 #1,3,4,6 Read 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.