Cardiovascular system

Cardiovascular system - November 7th 2007 Cardiovascular...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
November 7 th 2007 Cardiovascular system: Chapter 12 Three subunits- Heart, Vascular system, Blood 5L of blood flowing through the body at one time, 3L of plasma, 2L cellular elements Serum= plasma-fibrinogen (clotting agent) Hematocrit- Volume of red blood cells in blood (measured in percentage, for males usually 42%), determines thickness of blood, which alters viscosity and pressure. High altitude raises hematocrit High pressure circulation- flow to the entire body except to the lungs and to the heart (basically the systemic circuit). 85-90 mmHg Low pressure circulation- blood flow through the lungs, 13-15 mmHg Amount of blood in both circulations is identical (equal volume) Cardiac Output Main purpose of CV system- ensure adequate blood supply flow through the capillaries, getting oxygen and nutrients to the tissues. Valves ensure correct directional flow. The valves are passive and are opened by pressure. AV valves open and close at the same time, semilunar valves open and close at same time. During systole AV valves are closed (left AV-bicuspid, right AV-tricuspid) and
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/18/2008 for the course BIO 328 taught by Professor Cabot during the Fall '07 term at SUNY Stony Brook.

Page1 / 2

Cardiovascular system - November 7th 2007 Cardiovascular...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online