The Venous System: Venules, Veins, and Blood Flow
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Questions and Answers

What is the main method used to measure blood pressure?

  • Using an EKG machine
  • Listening for Korotkoff sounds with a stethoscope (correct)
  • Visual examination of arteries
  • Taking a urine sample

Which of the following factors will increase blood pressure?

  • More hypovolemia
  • A wider vessel radius
  • Increased vessel compliance
  • Thicker blood viscosity (correct)

What effect does a narrower and longer blood vessel have on blood flow?

  • Increases resistance and decreases flow (correct)
  • Increases resistance and increases flow
  • Decreases resistance and increases flow
  • Decreases resistance and decreases flow

Which artery is commonly used to feel the pulse in the neck?

<p>Carotid artery (C)</p> Signup and view all the answers

How does an increase in cardiac output affect blood pressure?

<p>Increases blood pressure (C)</p> Signup and view all the answers

What is the main function of arteries in the circulatory system?

<p>Carry blood away from the heart (B)</p> Signup and view all the answers

Which type of artery is characterized by having a diameter ranging from 0.1mm to 10mm?

<p>Muscular artery (B)</p> Signup and view all the answers

What is the function of precapillary sphincters in the circulatory system?

<p>To allow blood into a capillary bed (D)</p> Signup and view all the answers

Which type of capillary has small gaps in its wall to allow plasma proteins and cells to pass through?

<p>Sinusoid capillary (D)</p> Signup and view all the answers

What is the primary function of venules?

<p>Allow for diapedesis to occur (C)</p> Signup and view all the answers

Why do veins have valves?

<p>To prevent backflow due to low pressure and gravity (B)</p> Signup and view all the answers

What would happen if all precapillary sphincters were open?

<p>Every drop of blood would be in a capillary bed (D)</p> Signup and view all the answers

How does the diameter of arterioles affect blood pressure?

<p>Constricts arterioles to increase blood pressure (A)</p> Signup and view all the answers

What is the formula to calculate mean arterial pressure (MAP) from systolic and diastolic blood pressure?

<p>MAP = (systolic BP + diastolic BP) / 2 (A)</p> Signup and view all the answers

What is the role of pulse pressure in blood pressure measurements?

<p>Represents the difference between systolic and diastolic pressure (B)</p> Signup and view all the answers

Which component of blood pressure is characterized by the pressure during ventricular contraction?

<p>Systolic pressure (D)</p> Signup and view all the answers

What happens if the mean arterial pressure (MAP) falls below 60 mm Hg for an extended period of time?

<p>Risk of ischemia and hypoxia (D)</p> Signup and view all the answers

What is the function of vasa vasorum in blood vessels?

<p>Deliver nutrients and remove waste from the cells of larger vessels (A)</p> Signup and view all the answers

Which layer of blood vessels is primarily composed of smooth muscle supported by connective tissue?

<p>Tunica Media (B)</p> Signup and view all the answers

What do veins possess to prevent blood from flowing backward?

<p>Valves (C)</p> Signup and view all the answers

Which type of blood vessels have thicker walls to help maintain blood pressure?

<p>Arteries (B)</p> Signup and view all the answers

What is the main function of the external elastic membrane in large arteries?

<p>Separate the media from the outer tunic (B)</p> Signup and view all the answers

Which action leads to an increase in blood flow and a decrease in blood pressure?

<p>Vasodilation (D)</p> Signup and view all the answers

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