Bio 242 Lecture Exam 3
Which statement best describes arteries?
All carry blood away from the heart
Each of the following describes the action of aldosterone EXCEPT
It will result in higher sodium levels in the urine
Which tunic of an artery is most responsible for maintaining blood pressure and continuous blood circulation
Tunica media
Which of these hormones would have an effect of blood pressure
all of the above
The pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is
angina pectoris
The P wave of a normal electrocardiogram indicates
atrial depolarization
Which of the following is NOT part of the intrinsic conduction system of the heart
atrioventricular (AV) valve
The volume of blood flowing though vessels, organs, or the entire circulation in a given period describes
blood flow
Which of the following is the most significant source of blood flow resistance
blood vessel diameter
Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of
capillaries
Which of the following vessels does not empty directly into the right atrium
cardiac veins
Which of the following increases heart rate
cardioacceleratory center via sympathetic trunk
Norepinephrine acts on the heart by
causing threshold to be reached more quickly
The baroreceptors in the carotid sinus and aortic arch are sensitive to which of the following
changes in arterial pressure
Normal heart sounds are caused by which of the following events
closure of the heart valves
The "sucking" pressure created by plasma proteins in the blood describes
colloid osmotic pressure
the foramen ovale
connected the two atria in the fetal heart
Which of the following is a structure that holds cardiac cells together
desmosome
Respiratory gases, which are lipid soluble molecules, cross the capillary walls by
diffusing directly through endothelial membranes
Arteriolar blood pressure increase in response to all but which of the following
falling blood volume
Which of these layers is the most superficial of the pericardium
fibrous pericardium
Which of the following best describes the net flow of fluid at the capillaries?
fluid flows out at the arterial end and in at the venous end
Compared to skeletal muscle, cardiac muscle
has ga junctions that allow it to act as a functional syncytium
Peripheral resistance
increases as blood viscosity increases
Secondary hypertension can be caused by
kidney disease
Blood within the pulmonary veins returns to the
left atrium
Which of the following artery types are also known as distributing arteries and account for most of the named arteries in the body
muscular
Which of the following results from prolonged coronary blockage
myocardial infarction
Which of the following transports oxygen-rich blood
pulmonary vein
The left ventricular wall of the heart is thicker than the right wall in order to
pump blood with greater pressure
Which of the filling processes provides a long-term response to changes in blood pressure
renal regulation
In red bone marrow newly formed blood cells enter the circulation. You would expect to see many ______ in red bone marrow
sinusoid capillaries
Which of the following factors does NOT influence heart rate
skin color
The viscosity of blood flow is
slowest in capillaries
Failure of a valve to open is termed
stenotic valve
The amount of blood that is pumped out of one ventricle in one heart beat is called
stroke volume
Which of the following is an extrinsic control of blood flow
sympathetic nervous system
The term for an abnormally fast heart rate is
tachycardia
Which of the following areas of the brain does NOT have an influence on blood pressure
thalamus
Mechanisms that do NOT help regulate blood pressure include
the dural sinus reflex
Which of the following is a type of circulatory shock
vascular, due to extreme vasodilator as a result of loss of vasomotor tone
Which of the following means contraction of the ventricles
ventricular systole
The atrioventricular valves are closed
when the ventricles are in systole
Which of the following would have the LEAST influence on blood pressure
white blood cell count
