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