anatomy Ch23h - Human Anatomy McKinley &...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

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

Unformatted text preview: Human Anatomy McKinley & O'Loughlin Chapter 23: Vessels and Circulation Blood Vessels o An efficient mode of transport for oxygen, nutrients, and waste products to and from body tissues o Can pulsate and change shape in accordance with the bodys needs. Blood Vessels o Often share names with either the body region they traverse or the bone next to them. o Systemic circulation o Pulmonary circulation Three Main Classes of Blood Vessels o Arteries o Capillaries o Veins Blood Vessel Tunics o Tunica Intima, or Tunica Interna o Tunica Media Vasoconstriction Vasodilation o Tunica Externa, or Tunica Adventitia Arteries o Systemic arteries o Pulmonary arteries o Three basic types of arteries: elastic arteries muscular arteries arterioles Capillaries o Contain only the tunica intima o Are the functional units of the cardiovascular system o A capillary bed The Three Basic Kinds of Capillaries o Continuous capillaries o Fenestrated capillaries o Sinusoids, or discontinuous capillaries Veins o Drain capillaries and return the blood to the heart. o Systemic veins o Pulmonary veins o Hold about 60% of the bodys blood at rest. From Venules to Veins o Venules merge to form veins. o Most veins contain one-way numerous valves to prevent blood backflow in the veins. o The skeletal muscle pump Blood Pressure o Blood pressure is the force exerted on the inside of the vessel walls o BP is usually measured in mmHg The sphygmomanometer Normal value 120/80 o BP is greatest in the large arteries close to the heart, and gradually falls as the blood moves...
View Full Document

Page1 / 8

anatomy Ch23h - Human Anatomy McKinley &...

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