26 Questions
Which layer of a blood vessel contains muscles for vasoconstriction and vasodilation?
Tunica media
Where are vasa vasorum located more closely to the lumen?
Veins
Which type of blood vessel has thicker walls due to higher pressure from pumped blood?
Arterioles
What is responsible for binding the endothelium to the connective tissue in blood vessels?
Basal lamina
Which layer of a blood vessel primarily consists of collagenous fibers?
Tunica externa
Which type of blood vessels have valves to prevent backflow due to low pressure?
Venules
What is the main factor affecting blood flow and the quickest variable to change blood pressure?
Vessel diameter
Where is the most noticeable slowdown of blood flow observed according to the text?
At the artery to arteriole junction
Which hormone signals the kidneys to reabsorb water when blood volume drops?
Antidiuretic Hormone (ADH)
Which of the following hormones is involved in stimulating hematopoiesis?
Erythropoietin
What does Angiotensin 2 primarily cause in the body?
Increased vasoconstriction
Which of the following responses to a decrease in blood flow may result in increasing blood pressure?
Venoconstriction
What causes the release of Aldosterone in the body?
Increased angiotensin 2 levels
'Autoregulation of Perfusion' refers to:
'Self-regulation' of blood flow by local chemical signaling
'Myogenic response' in arterioles involves:
'Self-regulation' based on blood flow needs
'Hypovolemic shock' is often caused by what condition?
'Sudden loss of blood'
What is the main function of a metarteriole?
To regulate blood flow to capillary beds
Which type of capillary is known for having leaky walls, allowing larger molecules to pass through?
Sinusoid capillary
What is the average pressure in arteries known as?
Mean Arterial Pressure (MAP)
Why is a pulse taken at radial artery or carotid artery?
To determine a person’s pulse rate and strength
What happens if the Mean Arterial Pressure (MAP) falls below 60 mm Hg?
Ischemia due to insufficient blood flow
Which factor contributes to an increase in blood pressure?
Increased arterial stiffer
What is the primary function of a precapillary sphincter?
Control the flow of blood into capillaries
In adults, why does resistance increase in longer vessels?
More surface area
Why are veins affected by shunts or valves?
To prevent backflow due to low pressure or gravity
What is the role of muscular arteries?
Facilitate vasoconstriction with more smooth muscle
This quiz covers the structure and function of the human circulatory system, including the different types of blood vessels and their roles in the pulmonary and systemic circuits. Learn about the characteristics of arteries, arterioles, capillaries, venules, and veins.
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