20081015

20081015 - Lecture 19 Hemodynamics page #1 Lecture19...

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

View Full Document Right Arrow Icon
Lecture 19 Hemodynamics page #1 Lecture19 Hemodynamics (cont’d) Compliance: Example: Whales – cardiac output = 35 liters with only 12-18 beats/min. The very elastic large arteries branch into very narrow arteries very fast. So, the pressure reservoir is the large arteries with the smaller arteries serving mainly as conduits with a smooth steady flow. In a gill breathing fish the compliant bulbus and afferent branchial arteries maintain a smooth blood flow through the gills. This is aided by a relatively noncompliant dorsal aorta. The major compliance must be before, not after, the gills. Otherwise, blood would rush right through the gills with a powerful pressure pulse. Venous system Notable facts to remember: 1. Veins serve as conduits for blood flow back to the heart. 2. They are a large volume, low pressure system. 3. 50% of the blood volume is in the veins. 4. Blood pressure in the veins is < 11 mm Hg (this is maximum for humans) . 5. Veins serve as a storage reservoir for blood. a. blood loss Æ contraction (sympathetic adrenergic stimulation) and volume of veins. “The Venous Pump”
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.

Page1 / 5

20081015 - Lecture 19 Hemodynamics page #1 Lecture19...

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