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Physiology Wk 10Quiz
Question | Answer |
---|---|
Blood pressure is measured with the aid of an apparatus known as a(n) | sphygmomanometer. |
Blood volume per kilogram of body weight varies inversely with: | body fat |
The mechanisms of which three hormones work together to regulate blood volume? | aldosterone, ANH, and ADH |
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. |
Which of the following is(are) involved in determining a person’s total blood volume? | Age, Body Type, Sex |
The term used to describe the collection of mechanisms that influence the circulation of blood is: | hemodynamics |
Neutrophils are highly mobile and phagocytic. They migrate out of blood vessels and into tissue spaces. This process is called | diapedesis |
The physiological mechanism that dissolves clots is known as | fibrinolysis |
The heart begins beating in the fetus at about what stage of development? | after about 4 weeks |
_____ is used to determine the volume percentage of red blood cells in whole blood. | hematocrit |
The vagus is said to act as a “brake” on the heart. This situation is called | vagal inhibition |
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 |
A hematocrit of 56% would be an indication of: | polycythemia. |
A glycoprotein hormone that is secreted to increase oxygen concentration in the tissues is | erythropoietin |
All of the following are true statements except: | both atria receive their blood supply from branches of the right and left coronary arteries. |
A decrease in the amount of white blood cells is called | leukopenia |
Which two factors promote the return of venous blood to the heart? | blood-pumping action of respirations and skeletal muscle contractions |
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 difference between systolic pressure and diastolic pressure is called | pulse pressure |
Factors that affect the strength of myocardial contraction are called | inotropic factors |
Erythrocytes begin their maturation sequence in red bone marrow from nucleated cells known as: | hematopoietic stem cells. |
All of the following are components critical to coagulation except | These are all components critical to coagulation: prothrombin, thrombin, fibrinogen, fibrin. |
Which are the two baroreceptors that are located near the heart? | aortic baroreceptors and carotid baroreceptors |
Blood viscosity stems mainly from the red blood cells but also partly from the _____ in blood. | protein molecules present |
Which of the following is not true of ventricles? | None; The myocardium of the left ventricle is thicker than that of the right ventricle, The myocardium of the ventricles is thicker than that of the atria, and They are the pumping chambers of the heart. |
Inhibition of sympathetic vasoconstrictor impulses is considered a major mechanism of | vasodilation |
The localized pressure gradient needed to maintain blood flow in a tissue is called | perfusion pressure |
Cardiac output is determined by | stroke volume and heart rate |
The term blood type refers to the type of blood cell | antigen |
_____, a natural constituent of blood, acts as an antithrombin and prevents clots from forming in vessels. | Heparin |