The pulmonic valve closes when which of the following occurs?
(a) Aortic pressure drops below left ventricular pressure
(b) Left ventricular pressure drops below pressure in the pulmonary trunk
(c) Pulmonary trunk pressure drops below aortic pressure
(d) Pulmonary trunk pressure drops below right ventricular pressure
(e) Right ventricular pressure drops below pulmonary trunk pressure
Give this one a try later!
(e) Right ventricular pressure drops below pulmonary trunk pressure
Which of the following pairings shows a correct association between a type of blood
vessel and its primary physiological role?
(a) Major arteries = capacitance vessels
(b) Large veins = pressure reservoirs
(c) Capillaries = major sites of vascular resistance
,(d) Arterioles = sites of diffusive exchange
(e) Venules = micro vessels that drain tissue capillary beds
Give this one a try later!
(e) Venules = micro vessels that drain tissue capillary beds
The tunica media of an arterial wall consists primarily of which of the following
specialized cell types?
(a) Vascular endothelial cells
(b) Acidophils
(c) Mast cells
(d) Vascular smooth muscle cells
(e) Adventitial fibroblasts
Give this one a try later!
(d) Vascular smooth muscle cells
The baroreceptor response to sudden drop in blood pressure caused by extensive
bleeding from a traumatic wound would involve which of the following physiological
changes?
(a) A decrease in heart rate
(b) A decrease in cardiac output
(c) An increase in total peripheral resistance
(d) All of the above
(e) None of the above
Give this one a try later!
, (c) An increase in total peripheral resistance
Which of the following CORRECTLY explains why a neuron is less likely to launch
another action potential during the relative refractory period?
(a) All the voltage-gated Ca++ channels are open, so the membrane can't be
depolarized to initiate a new action potential
(b) All the voltage-gated Na+ channels are in use or inactivated, so the membrane
can't be depolarized to initiate a new action potential
(c) All the K+ leak channels are closed, so the neuron can't return to resting potential
(d) All the voltage-gated K+ channels are open and hyperpolarizing the neuron, so it
requires more depolarization to initiate a new action potential
(e) All the voltage-gated Na+ channels are closed, so the membrane can't be
depolarized to initiate an action potential
Give this one a try later!
(d) All the voltage-gated K+ channels are open and hyperpolarizing the
neuron, so it requires more depolarization to initiate a new action potential
For a person standing upright and breathing quietly near their functional residual
capacity, all of the following statements are true EXCEPT for which of the following?
(a) Transpulmonary pressure and alveolar size tend to be highest at the base of the
lung
(b) Alveoli at the apex of the lung tend to receive ventilation in excess of perfusion
(c) Alveoli at the base of the lung tend to receive perfusion in excess of ventilation
(d) A regional mismatch between ventilation and perfusion causes a light excess of
oxygen in the apex of the lung compared to the base of the lung
(e) Capillaries within the apex of the lung are intermittently compressed by large,
well-distended alveoli
Give this one a try later!
, (a) Transpulmonary pressure and alveolar size tend to be highest at the
base of the lung
Which of the following ECG leads records the potential difference between the left
leg and the right write, corresponding, approximately, to the anatomical axis of the
heart?
(a) Lead I
(b) Lead II
(c) Lead III
(d) Precordial lead V1
(e) Precordial lead V6
Give this one a try later!
(b) Lead II
When nitric oxide (NO) is released from vascular endothelial cells and exerts a
vasodilatory effect on nearby vascular smooth muscle cells, it serves the role of which
of the following factors?
(a) An autocrine factor
(b) A paracrine factor
(c) An endocrine factor
(d) An exocrine factor
(e) An apocrine factor
Give this one a try later!
(b) A paracrine factor
(a) Aortic pressure drops below left ventricular pressure
(b) Left ventricular pressure drops below pressure in the pulmonary trunk
(c) Pulmonary trunk pressure drops below aortic pressure
(d) Pulmonary trunk pressure drops below right ventricular pressure
(e) Right ventricular pressure drops below pulmonary trunk pressure
Give this one a try later!
(e) Right ventricular pressure drops below pulmonary trunk pressure
Which of the following pairings shows a correct association between a type of blood
vessel and its primary physiological role?
(a) Major arteries = capacitance vessels
(b) Large veins = pressure reservoirs
(c) Capillaries = major sites of vascular resistance
,(d) Arterioles = sites of diffusive exchange
(e) Venules = micro vessels that drain tissue capillary beds
Give this one a try later!
(e) Venules = micro vessels that drain tissue capillary beds
The tunica media of an arterial wall consists primarily of which of the following
specialized cell types?
(a) Vascular endothelial cells
(b) Acidophils
(c) Mast cells
(d) Vascular smooth muscle cells
(e) Adventitial fibroblasts
Give this one a try later!
(d) Vascular smooth muscle cells
The baroreceptor response to sudden drop in blood pressure caused by extensive
bleeding from a traumatic wound would involve which of the following physiological
changes?
(a) A decrease in heart rate
(b) A decrease in cardiac output
(c) An increase in total peripheral resistance
(d) All of the above
(e) None of the above
Give this one a try later!
, (c) An increase in total peripheral resistance
Which of the following CORRECTLY explains why a neuron is less likely to launch
another action potential during the relative refractory period?
(a) All the voltage-gated Ca++ channels are open, so the membrane can't be
depolarized to initiate a new action potential
(b) All the voltage-gated Na+ channels are in use or inactivated, so the membrane
can't be depolarized to initiate a new action potential
(c) All the K+ leak channels are closed, so the neuron can't return to resting potential
(d) All the voltage-gated K+ channels are open and hyperpolarizing the neuron, so it
requires more depolarization to initiate a new action potential
(e) All the voltage-gated Na+ channels are closed, so the membrane can't be
depolarized to initiate an action potential
Give this one a try later!
(d) All the voltage-gated K+ channels are open and hyperpolarizing the
neuron, so it requires more depolarization to initiate a new action potential
For a person standing upright and breathing quietly near their functional residual
capacity, all of the following statements are true EXCEPT for which of the following?
(a) Transpulmonary pressure and alveolar size tend to be highest at the base of the
lung
(b) Alveoli at the apex of the lung tend to receive ventilation in excess of perfusion
(c) Alveoli at the base of the lung tend to receive perfusion in excess of ventilation
(d) A regional mismatch between ventilation and perfusion causes a light excess of
oxygen in the apex of the lung compared to the base of the lung
(e) Capillaries within the apex of the lung are intermittently compressed by large,
well-distended alveoli
Give this one a try later!
, (a) Transpulmonary pressure and alveolar size tend to be highest at the
base of the lung
Which of the following ECG leads records the potential difference between the left
leg and the right write, corresponding, approximately, to the anatomical axis of the
heart?
(a) Lead I
(b) Lead II
(c) Lead III
(d) Precordial lead V1
(e) Precordial lead V6
Give this one a try later!
(b) Lead II
When nitric oxide (NO) is released from vascular endothelial cells and exerts a
vasodilatory effect on nearby vascular smooth muscle cells, it serves the role of which
of the following factors?
(a) An autocrine factor
(b) A paracrine factor
(c) An endocrine factor
(d) An exocrine factor
(e) An apocrine factor
Give this one a try later!
(b) A paracrine factor
