Biology 107

 

Lecture Notes: Circulation II.

Reading: Chapter 42 in text.

 

 

Blood vessels

Structural differences among the blood vessels correlate with regional functions of the circulatory system

 

Natural laws governing the movement of fluids in pipes affect blood flow and blood pressure

á      Blood flow velocity

 

á      Blood pressure:

 

Transfer of substances between the blood and interstitial fluid occurs across the thin walls of capillaries

á      Capillary exchange

 

á      The lymphatic system returns fluid to the blood and aids in body defense

 

Blood is a connective tissue with cells suspended in plasma

á      Plasma:

 

Cellular elements of blood

á      Erythrocytes :

á      Leukocytes:

á      Platelets:

 

Replacement of cellular elements

 

Blood clotting cascade

á      fibrinogen :

á       fibrin:

á      hemophilia:

 

Cardiovascular diseases are the leading cause of death in the US

 

á      Heart attack :

á      Stroke :

á      Thrombus:

á      Embolus:

á      Atherosclerosis :

á      Arteriosclerosis :

á      Ways to minimize risk: