Blood Vessels

Blood Vessels - Blood Flow Blood sent into aorta under...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Blood Flow Why is velocity slowest in capillaries? What is the benefit of slow speed? Blood sent into aorta under pressure from ventricular contraction Blood Vessels Arteries have muscular walls to aid heart in pushing blood through the system
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Pulse Points • Pulse points— feel pulsing of blood in arteries close to skin • Used to determine heart rate Measuring Blood Pressure –Cuff pressure is lower than pressure in left ventricle • Deflate till pulse inaudible –Cuff pressure less than lowest arterial pressure • Cuff inflated till pulse inaudible Pressure slowly released until pulse is first heard
Background image of page 2
3 Gases, nutrients, wastes follow concentration gradient Exchange in Capillaries Capillary Circulation Can Be Adjusted
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 To deal with increased demands for blood: Blood Flow in Veins Blood pressure minimal in veins so venous return dependent on: • compress veins, push blood to heart • inhalation decreases thoracic pressure, blood flows in direction of reduced pressure
Background image of page 4
5 Hypertension • Systolic • Affects ~20% of Americans • Forces heart to work harder, can lead to major health problems Causes: Causes: • Overactivity of genes for proteins that act as vasoconstrictors (narrow vessels) Treatment: Treatment: lifestyle changes, meds, gene therapy?
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/17/2008 for the course BIO 1004.212.0 taught by Professor Douglasmerrill during the Winter '07 term at RIT.

Page1 / 13

Blood Vessels - Blood Flow Blood sent into aorta under...

This preview shows document pages 1 - 6. Sign up to view the full document.

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