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Week 10

Heart and Blood

QuestionAnswer
Inhibition of sympathetic vasoconstrictor impulses is considered a major mechanism of vasodilation
Which two factors promote the return of venous blood to the heart? blood-pumping action of respirations and skeletal muscle contractions
The difference between systolic pressure and diastolic pressure is called pulse pressure
_____, a natural constituent of blood, acts as an antithrombin and prevents clots from forming in vessels. Heparin
A glycoprotein hormone that is secreted to increase oxygen concentration in the tissues is erythropoietin cardiac output is determined by stroke volume and heart rate
_____ is used to determine the volume percentage of red blood cells in whole blood. Hematocrit
All of the following are true statements except: both atria receive their blood supply from branches of the right and left coronary arteries.
The term used to describe the collection of mechanisms that influence the circulation of blood is: Hemodynamics.
Which of the following is not true of ventricles? They are the pumping chambers of the heart, The myocardium of the ventricles is thicker than that of the atria, and The myocardium of the left ventricle is thicker than that of the right ventricle.
In the extrinsic pathway of stage 1 of the clotting mechanism, chemicals released from damaged tissues trigger the cascade of events that ultimately result in the formation of prothrombin activator.
Which of the following is(are) involved in determining a person’s total blood volume? Age, body type, and sex
The mechanisms of which three hormones work together to regulate blood volume? aldosterone, ANH, and ADH
Erythrocytes begin their maturation sequence in red bone marrow from nucleated cells known as: hematopoietic stem cells.
Neutrophils are highly mobile and phagocytic. They migrate out of blood vessels and into tissue spaces. This process is called Diapedesis
Blood viscosity stems mainly from the red blood cells but also partly from the _____ in blood. protein molecules present
Blood pressure is measured with the aid of an apparatus known as a(n) Sphygmomanometer.
The physiological mechanism that dissolves clots is known as Fibrinolysis.
Which are the two baroreceptors that are located near the heart? aortic baroreceptors and carotid baroreceptors
Starling’s law of the heart states that, within limits, the longer, or more stretched, the heart fibers are at the beginning of the contraction, the stronger the contraction
The localized pressure gradient needed to maintain blood flow in a tissue is called perfusion pressure.
The heart begins beating in the fetus at about what stage of development? After about 4 weeks
Blood volume per kilogram of body weight varies inversely with: body fat
A hematocrit of 56% would be an indication of: Polycythemia
Factors that affect the strength of myocardial contraction are called inotropic factors
The vagus is said to act as a “brake” on the heart. This situation is called vagal inhibition
What is the functional significance of large areas of cardiac muscle being electrically coupled to form a single functional syncytium? Because they form a syncytium, muscle cells can pass an action potential along a large area of the heart wall, stimulating contraction in each muscle fiber of the syncytium.
All of the following are components critical to coagulation except none of the above; all of these components are critical to coagulation
A decrease in the amount of white blood cells is called Leukopenia
The term blood type refers to the type of blood cell Antigen
Created by: Sandoval.Sam
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