lecture14-11

lecture14-11 - Lecture 14! The Circulatory System! most...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
simple cardiovascular system: pump (heart) exchange system (capillaries) collecting tubes (veins) distributing tubes (arteries) The Circulatory System Lecture 14 •most obvious function: transport and distribute essential substance (O 2 and nutrients), and remove waste produce (CO 2 and urea). also: •regulation of body temperature • communication between cells via hormones •regulates distribution of O 2 and nutrient supply in different physiological states
Background image of page 1

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

View Full DocumentRight Arrow Icon
-the heart •two pumps is series - notice that the left side (systemic circulation) is more muscular than the right side (pulmonary circulation). •blood enters the right side through the Inferior Vena Cava and the Superior Vena Cava and exits through the Pulmonary Artery to enter the lungs. •oxygenated blood returns via the Pulmonary Veins and then exits to the rest of the body by the Aorta . Several tissue types in the heart: 1. Endocardium - inner lining of the heart chambers. Composed of a layer of endothelial cells, which are a type of epithelial cells (cells that are tightly bound together and form sheets). 2. Myocardium - the heart muscle cells, arraigned spirally around the heart. 3. Epicardium - a protective membrane covering the heart 4. pericardium - not part of the heart proper. It is a fiberous sac that contains the heart.
Background image of page 2
AV Cardiac Valves: •Ensure that blood fows only in one direction. •Two types Found in heart: atrioventricular (AV) •Consists oF faps on tough ±berous tissue. •found between atria and ventricles •on the right side the valve has three flaps (cusps) tricuspid valve • the left AV valve has two cusps, bicuspid valve •the area of the flaps is about twice the opening, lots of overlap for tight seal. •the free edges of the flaps are attached to
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/14/2011 for the course MCDB 111 taught by Professor Smith during the Spring '11 term at UCSB.

Page1 / 16

lecture14-11 - Lecture 14! The Circulatory System! most...

This preview shows document pages 1 - 4. Sign up to view the full document.

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