Benchmark: SC. 912.L.14.36
Learning Objectives:
There are three (3) factors affect resistance:
Diameter of the blood vessel
If Resistance increases, Blood flow decreases, and blood pressure increases
Example:
If the diameter of the blood vessel decreases (vasoconstriction), then resistance increases.
This happens during atherosclerosis
The opposite will happen if the diameter increases (vasodilation)
During atherosclerosis the diameter of the blood vessel decreases, thus increasing resistance.
Vocabulary
LecturesTutorials EOC Practice QuestionsActivitiesReading/Note-taking/ Assessment Questions: Chapter 33 Textbook Pages 948-961
Factors that affects blood flow
Diagram: The Heart and trace the flow of oxygenated and deoxygenated blood through the heart, lungs, and body
Lab Bench: Circulatory Physiology
Video Game: Case of the Ailing Heart
Edgenuity: SC. 912.L.14.36 The Cardiovascular System
Worksheets
C
Learning Objectives:
- Students will identify factors that affect blood flow and/or describe how these factors affect blood flow through the cardiovascular system. Items may address factors such as blood pressure, blood volume, resistance, disease, and exercise.
- Students will be able to diagram blood flow of oxygenated and deoxygenated blood through the heart, lungs, and body.
- Students will be able to explain the relationship between pressure, resistance, and blood flow.
- Students will be able to describe various diseases related to the cardiovascular system.
There are three (3) factors affect resistance:
- Viscosity of the blood
- Length of the blood vessels
- Diameter (radius) of the blood vessel
Diameter of the blood vessel
If Resistance increases, Blood flow decreases, and blood pressure increases
Example:
If the diameter of the blood vessel decreases (vasoconstriction), then resistance increases.
This happens during atherosclerosis
The opposite will happen if the diameter increases (vasodilation)
During atherosclerosis the diameter of the blood vessel decreases, thus increasing resistance.
- * If Resistance increases, Blood flow decreases, and blood pressure increases
Vocabulary
- Blood pressure: Pressure exerted against the blood vessel walls by moving blood. ls highest as left ventricle squeezes, contracts, and is lowest at right atrium when deoxygenated blood comes from the body.
- Blood volume: Volume of blood (both red blood cells and plasma) in the circulatory system of any individual. A typical adult has a blood volume of approximately 5 liters, with females generally having less blood volume than males.
- Resistance: Force that slows down blood flow. Ex. The resistanceoffered by theconstriction (narrowing) of peripheralvessels to the blood flow in the circulatorysystem.
- Viscosity: Thickness of the blood. The greater the viscosity, the less easily molecules slide past one another and the more difficult it is to get the fluid moving and keep it moving. Ex. Viscosity increases in individuals with diabetes.
- Atherosclerosis: Condition in which arteries become narrower due to the deposit of fatty material (cholesterol), and flow of blood decreases, vessels become less elastic, and lead to high blood pressure. May lead to stroke (in brain) or heart attack.
- Diabetes: Medical conditions that slow down blood flow. In diabetes, there is an elevated level of sugar in the blood.
This increase in glucose causes the blood to be viscous or thicker causing the flow to decrease. - Sickle Cell Anemia: Genetic disease caused by a mutation that produces abnormal red blood cells in a “C” shape. This cells get stuck, block vessels and clump together. Individuals suffer from pain, tiredness, and require blood transfusions.
- Hypertension: Blood pressure in arteries is elevated (140 / 90 or higher), caused by diet high in salts, sustained stress or by atherosclerosis: If arteries lose their elasticity and become more rigid, blood pressure increases. Hypertension causes small tears in blood vessels, setting the stage for atherosclerosis. Uncontrolled hypertension can lead to: Heart attack, Stroke, Kidney damage.
- Vasoconstriction: The narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, in particular the large arteries and small arterioles.
- Vasodilation: refers to the widening of blood vessels.
LecturesTutorials EOC Practice QuestionsActivitiesReading/Note-taking/ Assessment Questions: Chapter 33 Textbook Pages 948-961
Factors that affects blood flow
Diagram: The Heart and trace the flow of oxygenated and deoxygenated blood through the heart, lungs, and body
Lab Bench: Circulatory Physiology
Video Game: Case of the Ailing Heart
Edgenuity: SC. 912.L.14.36 The Cardiovascular System
Worksheets
C