BIOC34H3 Lecture 1: Chapter-1-4-Notes

57 views7 pages

burgundymosquito706

6 Oct 2016

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

3 factors that contribute to resistance of blood flow: length, viscosity of blood and radius. Resistance to blood flow results from friction. Friction = atoms and molecules attracted to each other. Blood is electrostatically attracted to the vessel wall goes against blood flow. Atomic interactions btwn the blood and vessel molecules opposes the movement. Long length = more friction and resistance to blood flow. Short length = less friction and resistance to blood flow. Narrow = greater atomic interactions and more resistance. Broad = less atomic interactions and less resistance. Atomic interactions btwn the layers of blood flowing in the vessel. Any interaction with the layer will oppose blood flow. One layer of blood vessel is slowing down = other layers slow down the blood (even though they are not attracted to the wall) Increase in friction = slow down in blood flow. Picture shows a blood vessel with flow rate of.

Related Questions

Question 6 (1 point)Save Question 6Save
When end-diastolic volume is increased, the force of the myocardialcontraction is increased. This is due to _________?

a shift in the operating point of the myocardial length-tensioncurve

an increased release of calcium

stretch-induced parasympathetic activity

a decreased afterload in the arteries
Question 7 (1 point)Save Question 7Save
Match the vessel characteristic on the left with the appropriatevessel type on the right (each vessel type will be used more thanonce, only 1 BEST answer for each characteristic).

Substance exchange with the tissues takes place in thesevessels

These vessels are the main site of vascular resistance

Active hyperemia directly affects the diameter of thesevessels

Very low resistance vessels that act as a pressure-reservoir due totheir elasticity

These vessels contain one-way valves throughout their length

The walls of these vessels are composed of a single layer ofendothelial cells and a thin basement membrane

Very low resistance vessels that serve as a volume reservoir due totheir compliance

The velocity of blood flow is the least in these vessels

These vessels carry blood back to the heart

Blood flow in these vessels is directly aided by the skeletalmuscle pump

The total cross-sectional area of this type of vessel(cross-sectional area of all these vessels combined) exceeds thetotal cross-sectional area of every other type of bloodvessel

These are the first vessels that carry blood away from theheart

1.
Arteries
2.
Arterioles
3.
Capillaries
4.
Veins
Question 8 (1 point)Save Question 8Save
Which of the following selections correctly completes thestatements: The primary mechanism via which gasses (oxygen andcarbon dioxide), ions, and nutrients are exchanged between thecapillaries and the tissue is ______.

Diffusion

Active transport

Bulk flow

More than one of the above is correct.
Question 9 (1 point)Save Question 9Save
Which of the following changes will favor an increase in absorptionat the capillaries?

An increase in plasma osmolarity.

An increase in interstitial fluid osmolarity.

An increase in capillary fluid hydrostatic pressure.

A decrease in interstitial fluid hyrdrostatic pressure.

More than one of the above selections is correct.
Question 10 (1 point)Save Question 10Save
Correct order the following events that would occur due to a dropin MAP.

Sympathetic activation increases and parasympathetic activationdecreases

Heart rate, stroke volume, cardiac output, and total peripheralresistance increase.

MAP rises.

Baroreceptor firing decreases

redhedgehog584

BIOC34H3 Lecture 1: Chapter-1-4-Notes

Document Summary

Get access

Related Documents

BIOC34H3 Lecture Notes - Lecture 7: Hematocrit, Pulmonary Artery, Blood Vessel

BIOC34H3 : study guide

BIOC34H3 Study Guide - Aorta, Cardiac Output, White Blood Cell

Related Questions