30 Questions
What is the main function of the pulmonary circulation?
To exchange respiratory gases (O2 and CO2)
What is the relationship between pressure, volume, and resistance in the pulmonary circulation?
Pressure and volume are directly proportional, while resistance is inversely proportional
What is the characteristic of the pulmonary capillaries?
They have a large diameter and many anastomoses
What is the pressure in the pulmonary circulation compared to the systemic circulation?
The pressure is 1/6 of the systemic circulation
What is the deoxygenated blood flow path in the pulmonary circulation?
From the right ventricle to the pulmonary artery, then to the pulmonary veins, and finally to the left atrium
What is the function of the cutaneous circulation?
To regulate body temperature and blood pressure
What is the role of the blood-brain barrier in the cerebral circulation?
To protect the brain from harmful substances while allowing the passage of essential molecules
What is the primary function of pulmonary capillaries?
To filter venous blood from clots and debris
What is the mean pulmonary artery pressure?
15 mmHg
How does the sympathetic nervous system affect the pulmonary circulation?
It causes pulmonary vasoconstriction, shifting blood to the systemic circulation
What is the effect of hypoxia (decreased oxygen tension) on the pulmonary circulation?
It causes vasoconstriction in affected alveoli, shifting blood to other healthy alveoli
How does gravity affect the pulmonary circulation?
Gravity has a marked effect on the pulmonary circulation
What is the relationship between pulmonary blood flow and pulmonary resistance?
Pulmonary blood flow is inversely proportional to pulmonary resistance
How does the pulmonary resistance compare to the systemic resistance?
Pulmonary resistance is 1/7 of systemic resistance
In the standing position, the pattern of pulmonary blood flow is:
Intermittent at the apex and continuous at the base
The primary function of arterioles in the cutaneous circulation is:
Regulating body temperature
The 'white line reaction' observed in the cutaneous circulation is caused by:
Constriction of precapillary sphincters
Which of the following is NOT a stage of the 'triple response of Lewis' in the cutaneous circulation?
Blanching
The cerebral blood flow is approximately:
750 ml/min
The blood flow to the gray matter of the brain is _____ times higher than the blood flow to the white matter.
6
The cerebral circulation is particularly sensitive to ischemia and hypoxia due to:
Its high metabolic rate
Which of the following is true about brain metabolism?
Brain metabolism is aerobic (requires oxygen)
What is the approximate volume of cerebrospinal fluid (CSF) surrounding the brain?
150 ml
Which of the following is NOT a function of cerebrospinal fluid (CSF)?
Regulation of blood pressure in the brain
What is the primary function of the blood-brain barrier?
To keep the internal environment of the central nervous system in a homeostatic state
Which of the following is NOT a component of the blood-brain barrier?
Neurons
What is the primary function of the pulmonary circulation?
To transport deoxygenated blood from the heart to the lungs
Which of the following factors does NOT affect resistance in the pulmonary circulation?
Temperature
What is the primary function of the cutaneous circulation?
To regulate body temperature through vasodilation and vasoconstriction
Which of the following statements about the cerebral circulation is NOT true?
The brain can use both glucose and fats as sources of nutrition
Test your knowledge on the pulmonary, cutaneous, and cerebral circulations along with the functions of pulmonary vessels, relationship between pressure, volume, flow, and resistance in pulmonary circulation, cutaneous circulation, cutaneous vascular reactions, characteristics of cerebral circulation, CSF, and blood flow. Perfect for medical physiology students!
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