18 Questions
What factor determines the continuous blood flow in the capillaries?
Elasticity of the aorta and arteries
What is the volume of blood flowing through the cross-section of a vessel per unit time directly proportional to?
Pressure differences at the beginning and end of the vessel
Which of the following changes in functional parameters is involved in arteriolar dilatation and a decrease in blood pressure?
Decreased tone of the sympathetic system
Which of the following does not affect blood pressure?
Number of leukocytes in the blood
What is the primary factor that determines blood flow through a vessel?
Resistance of the vessel to blood flow
Which of the following is a factor that reduces the linear speed of blood flow?
Blood viscosity
What is the primary factor that determines the rhythmic nature of the heart?
Anatomy of the sinus node
Which hormone serves as the first line of defense in reducing blood pressure caused by blood loss?
Adrenaline
What is the primary factor that determines blood pressure?
Venous return
What causes continuous blood flow in the vessels despite pulsatile systolic ejection?
Elasticity of the aorta and large arteries
What type of blood vessels create the general resistance of the bloodstream?
Arterioles
What is the term for the ability of the heart muscle to contract according to the amount of blood it contains?
Starling's law
What are the normal limits of blood pressure fluctuations in healthy people according to the World Health Organization (WHO)?
90/60-139/89
What is the lowest linear blood flow velocity typically found in?
capillaries
What is the typical systolic volume (SV) and minute volume of blood circulation (MCV) at rest?
60-80ml, 4-5l
How does the pressor section of the vasomotor center (VDC) mediate its effect on blood vessels?
activation of the spinal centers of the sympathetic nervous system
During depolarization of a myocardial action potential, what is the nature of excitability?
increased excitability
What is the reason for the dicrotic rise on a sphygmogram?
ventricular contractions
Test your knowledge of human physiology, covering topics such as the nervous system, blood flow, and circulation. Questions include the vagal bulbar region, sympathetic spinal, and the factors affecting blood flow.
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