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Bio 431 Heart, Cardiovascular system, Blood Unit 1 Exam 1 Questions and Answers
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Bio 431 Heart, Cardiovascular system, Blood Unit 1 Exam 1 Questions and Answers
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Bio 431 Heart, Cardiovascular system,Blood Unit 1 Exam 1 Questions and
Answers
Which plasma protein plays a critical role in blood clotting? - Answer-Fibrinogen
Ferritin is a protein used to do what? - Answer-Store iron in the liver, muscle, and
spleen
The process of a white blood cell squeezing between endothelial cells to exit a blood
vessel is called? - Answer-Emigration
This powerful inhibitor of platelet adhesion and release opposes the action of
thromboxane A2 - Answer-Prostacyclin
The visceral layer of the serous pericardium is also called the? - Answer-Epicardium
The structure in the fetus that allows blood to flow directly from the pulmonary trunk to
the aorta - Answer-Ductus Arteriosus
Which valve prevents blood from flowing back into the right ventricle? - Answer-
Pulmonary semilunar valve
Deep veins have the same names as their corresponding? - Answer-Arteries
Cardiac muscle fibers are electrically connected to neighboring fibers by? - Answer-Gap
junctions
What is the correct sequence of structures that a cardiac action potential follows in
order to excite normal contraction of the heart? - Answer-SA node, AV node, Bundle of
His, Purkinje fibers
Which wave in an ECG represents the repolarization of the ventricles? - Answer-T wave
What term refers to the period of time during a cardiac cycle when contraction of a
chamber occurs and pressure within the chamber rises? - Answer-Systole
Contraction of the ventricles of the heart leads to blood moving directly into? - Answer-
Arteries
The formula for calculating cardiac output: - Answer-Heart rate multiplied by stroke
volume
(CO = SV x HR)
, An increase in the carbon dioxide levels in the blood leads to a change in the chemical
composition of the blood. This input would be received by what part of the brain that
regulates heart rate? - Answer-Medulla oblongata
The three structural layers of a generalized blood vessel from innermost to outermost
are the? - Answer-Tunica interna (intima), Tunica media, Tunica externa (adventia)
The body contains three different types of capillaries: - Answer-Continuous,
Fenestrated, Sinusoid
In resting individuals, which blood vessels serve as a large blood reservoir from which
blood can be quickly diverted to other vessels as needed? - Answer-Veins and venules
Substances enter and leave capillaries by three basic mechanisms: - Answer-Diffusion,
Bulk flow, Transcytosis
Which is the most important method for capillary exchange? - Answer-Diffusion
What is the equation for calculating mean arterial pressure (MAP)? - Answer-MAP =
Diastolic BP + 1/3 (systolic BP - diastolic BP)
Besides the heart two other mechanisms "pump" blood from the lower body back to the
heart: - Answer-Skeletal muscle pump and Respiratory pump
Which hormone would not stimulate changes that lead to an increase in arterial blood
pressure? - Answer-Atrial natriuretic peptide (ANP)
The chemical histamine causes capillary walls to become more permeable. Excess
histamine secretion, as might be seen in allergic responses, might lead to: - Answer-
Edema
A blockage to one or both of the inferior phrenic veins will cause a backup of blood into
what structure? - Answer-Diaphragm
Nutrients from digested food enter the liver via the? - Answer-Hepatic portal circulation
How long do red blood cells live and why? - Answer-120 days due to wear and tear on
their plasma membranes as they squeeze through blood capillaries
Excess iron in the body can cause damage to which organs of the body (4)? - Answer-
Liver, Heart, Pancreatic islets, and Gonads
The main stimulus for erythropoiesis is? - Answer-Hypoxia
The granular leukocytes are: - Answer-Neutrophils, Eosinophils, and Basophils
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