Factors Influencing Blood Pressure in the Cardiovascular System

The video tutorial explains how blood pressure is influenced by peripheral resistance, vessel elasticity, blood volume, and cardiac output. It details the factors affecting peripheral resistance, including vessel diameter, blood viscosity, and vessel length. The tutorial also covers the role of vessel elasticity and blood volume in regulating blood pressure, and how cardiac output, determined by heart rate and stroke volume, impacts blood pressure. The video concludes with a summary of these concepts.

What is one of the main factors that increases blood pressure?

• Decreased vessel diameter

• Increased vessel diameter

• Decreased blood viscosity

• Decreased vessel length

What is the effect of a smaller blood vessel diameter on blood flow?

• Decreases resistance

• Increases resistance

• Decreases blood pressure

• No effect on resistance

What role do vasomotor fibers play in regulating blood vessel diameter?

• They decrease diameter

• They stabilize diameter

• They increase diameter

• They have no effect

What happens to blood pressure when blood viscosity increases?

• Increases

• Remains the same

• Becomes variable

• Decreases

What is the consequence of increased hematocrit on blood viscosity?

• Decreases viscosity

• Increases viscosity

• No change in viscosity

• Reduces blood flow

What happens to blood pressure when total vessel length increases?

• Stays the same

• Increases

• Decreases

• Becomes unpredictable

How does arteriosclerosis affect blood vessel elasticity?

• Makes them rigid

• Makes them expand more

• Does not affect elasticity

• Makes them more elastic

What effect does increased blood volume have on blood pressure?

• Increases pressure

• Fluctuates pressure

• Decreases pressure

• No change

How does a decrease in stroke volume affect blood pressure?

• Decreases it

• Varies it

• Increases it

• No effect

How does cardiac output influence blood pressure?

• No influence

• Decreases it

• Increases it

• Only affects heart rate