1. Welcome Back! Quiz today postponed to Friday
Friday Jan 13th: QUIZ Blood Components + Blood Types
Tuesday Jan 17th: QUIZ Heart + Circulation anatomy
Thursday Jan 19th: QUIZ Lymphatic System
Friday Jan 20th: TEST Circulation System + Lymph
Tuesday Jan 31st: Midyear Exam

2. Blood Vessels Capillaries
Smaller, branched off, narrow arteries called arterioles branch off and narrow further into capillaries
Smallest blood vessels Fig. 6.34
So narrow that 1 RBC travel single file through them
Walls are very thin (made up of single cell layer)
Thin walls ease exchange of O2 and CO2 between blood and organ cells (as well as nutrients and waste)

4. Blood Vessels Veins Pg 183 Fig. 6.35
Veins in lower parts of body (eg: leg) blood must flow against gravity
Veins have valves to keep blood from flowing downward
Pg 183 Fig. 6.35

6. Once the capillaries have irrigated the organs (flushing or washing out) they unite to venules, that turn into larger veins
Blood travels from the heart through the veins
Pressure inside vein is very low
Blood moves forward to return the heart with muscular contractions
These press against the veins and cause the blood to circulate

7. Path of Blood
Arteries  arterioles  capillaries  venules  veins

8. The Heart Heart is an organ that stimulates the movement of blood
In an adult it is the size of a fist and is located between the lungs in the thoracic cage
What does the inside of the heart look like and how does it work?
Fig. 6.37

10. Blood flows from atrium to ventricle on right and left side
Blood passes through valves to do so (atrioventricular valves)
Atrioventricular valves keep blood from moving backwards

11. Inside the heart 4 cavities Right atrium Right ventricle Left atrium
Left ventricle
Right atrium linked with right ventricle
Left atrium linked to the left ventricle
Right and left side of the heart do not communicate
They are separated by a partition: Septum

15. Heart and blood vessels
Several blood vessels are attached to the heart
Veins: superior and inferior vena cava and pulmonary veins - attached to both atria (plural of atrium) allowing blood to enter heart
Arteries: aorta and pulmonary arteries – attached to ventricles to carry blood as it exits

16. Function of heart
Blood enters the Atria, when the heart is at rest and relaxed
Filling phase = DIASTOLE
Atrias contract simultaneously forcing blood into Ventricles, then Ventricles contract forcing blood into arteries of the heart.
Contraction phase = SYSTOLE
Pulse you feel in your throat or wrist is from the contraction of the left ventricle
Heart rate vary from person to person…why?
Best to take Resting Heart Rate lying down!

17. Circulation Routes Pg. 185
Since the heart is split into 2 parts (by the partition) blood can be pumped out of each side along 2 different routes
Right Side = Pulmonary Circulation
Left Side = Systemic Circulation

19. Use red and blue to colour oxygenated and deoxygenated blood on diagram
Worksheet
P. 195 # 10 – 15

20. Heart Bypass Surgery If time allows…