BIOL 224 - Exam 1 Practice questions
After brain surgery, a patient receiving postoperative care in an intensive care unit began to pass large volumes of very dilute urine. The ICU nurse administered a medicine that mimics one of the following hormones. Which one?
ADH
During ventricular systole, the
AV valves are closed
Considering the left ventricle, why does isovolumetric ventricular contraction occur during ventricular systole?
Aortic pressure is higher than ventricular pressure and the ventricle must pressurize the blood to open the aortic valve.
A patient has an end-diastolic volume of 125 ml. A heart attack has weakened her left ventricle so it can pump a stroke volume of only 40 ml. Calculate her end-systolic volume.
85 ml
The common pathway of coagulation begins with the
activation of Factor X, production of prothrombin activator.
The most abundant proteins in blood plasma are
albumins
The ________ deliver(s) blood to the myocardium.
coronary arteries
If the force of ventricular contraction increases, what will happen to the end-systolic volume?
decrease
The P wave of the electrocardiogram is a signal from
depolarization of the atria
Hormones from the adrenal cortex that regulate electrolyte balance are
mineralocorticoids
Abnormal heart sounds caused by turbulent flow through faulty valves are called
murmurs
Each of the following factors will increase cardiac output except increased
parasympathetic stimulation (because it's rest and digest)
A person's blood type is determined by the
presence of specific glycoproteins on the cell membrane
The chief difference between plasma and interstitial fluid involves the concentration of
proteins
Most of the iron that is removed from degraded hemoglobin is
recycled to the red bone marrow
In adults, the only site of red blood cell production, and the primary site of white blood cell formation, is the
red bone marrow
The volume of blood ejected from each ventricle during a contraction is called the
stroke volume
The conversion of fibrinogen to fibrin is catalyzed by the enzyme
thrombin
The T wave on an ECG tracing represents
ventricular repolarization
Which of the following would cause stroke volume to increase?
when diastolic blood pressure is decreased
Shelly has a hormone-secreting tumor of the suprarenal gland. The tumor is causing her to have a deep voice, grow extensive body hair, and stop menstruating. This tumor probably involves cells of the
zona reticularis
How would removal of calcium ions from a blood sample affect coagulation?
Coagulation would be prevented
Abnormally slow depolarization of the ventricles would most change the shape of the ________ in an ECG tracing.
QRS complex
The principle that increasing the end-diastolic volume results in a corresponding increase in the stroke volume is known as
Starling's law of the heart
The long plateau phase of the cardiac muscle action potential is due to
calcium channels remaining open
Which of the following hormones increases production of red blood cells?
erythropoietin
A plasma protein essential for blood coagulation is
fibrinogen
Hormones produced by the anterior lobe of the pituitary gland that regulate the male and female reproductive organs are collectively called
gonadotropins
If a patient is administered a powerful glucocorticoid (such as prednisone) to suppress the immune system, what unintended effects might this have on blood chemistry?
increase of blood glucose
The pancreatic hormone that causes blood sugar levels to fall is
insulin
Which of the following elements is necessary for the production of thyroid hormone?
iodine