aim: describe the structures and functions of arteries, capillaries and veins. obj: given activity...

Aim: Describe the structures and functions of arteries, capillaries and veins.

OBJ: Given activity sheet SWBAT describe the structures and functions of arteries, capillaries and veins with 70% accuracy.

DN: HW Check- Body’s Transport System;Watch Blood Vessels Video

ACT: Review : Blood VesselsText, read p. 85-89; Complete A Closer Look At Blood Vessels BookletWatch Heart Video; Circulatory System video

HW: Work on CRE Review Sheets; CRE Exam, March 9; INERH Exam, March 20

Blood Vessels

Arteries: blood flows away from the heart; 3 cell layers, thick walledVeins: blood flows towards the heart; Valves prevent backflow due to low blood pressure;3 cell layers, thin walledCapillaries: connect arterioles to veinuoles; The site of capillaries/tissues is where nutrient/waste exchange by diffusion takes place; 1 cell layer

Blood VesselsPulse: expansion and relaxation of the artery wallDiffusion (osmosis): movement of molecules from an area of high concentration to an area of low concentration (through membrane).Blood Pressure: caused by the contraction of the heart’s ventricles. As blood moves away from the heart, blood pressure decreases.

Higher Pressure

Lower Pressure

Capillary(nutrient & waste)

Exchange withTissue (Body) Cells

Capillary(nutrient & waste)

Exchange withTissue (Body) Cells