Term
T/F
According to the Frank-Starling law of the heart, the greater the end-diastolic volume is, the greater the stroke volume will be |
|
Definition
|
|
Term
T/F
During the cardiac cycle, the atria and ventricles contract at the same time to ensure efficient pumping action |
|
Definition
|
|
Term
T/F
The first heart sounds signals the onset of ventricular diastole |
|
Definition
|
|
Term
T/F
Cardiac muscles move toward its optimal length to generate tension as more blood enters the heart and cardiac muscle is stretched |
|
Definition
|
|
Term
T/F
The majority of single-unit smooth muscle has sympathetic as well as parasympathetic innervation |
|
Definition
|
|
Term
T/F
Measurement of arterial pressure using a sphygmomanometer (blood pressure cuff) is possible because turbulent flow can be heard by a stethoscope placed over a closed artery |
|
Definition
|
|
Term
T/F
The left AV (atrioventricular) valve controls the amout of blood entering the left ventricle from the left atrium |
|
Definition
|
|
Term
T/F
The end-diastolic volume is the maximum amount of blood in the ventricle after ventricular filling is complete |
|
Definition
|
|
Term
| Which of the following is a characteristic of capillaries? |
|
Definition
| have lower resistance than arterioles |
|
|
Term
Whats the correct relationship between sodium, blood volume and blood pressure in the circulatory system?
|
|
Definition
| If there's an increase of sodium, the mean arterial pressure increases |
|
|
Term
| Adjacent cardiac muscle cells are joined together end-to-end in teh ventricles by |
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
| receives most of its blood supply by means of the coronary circulation |
|
|
Term
| Although th heart does not require the nervous system to initiate contraction events: |
|
Definition
|
|
Term
|
Definition
| occurs by activation of alpha1 receptors in teh majority of arterioles |
|
|
Term
Given the following forces acting at a given point across the capillary wall, what type of fluid movement will be taking place at that point?
Hydrostatic blood pressure = 21 mm Hg
Plasma osmotic pressure = 23 mm Hg
Interstitial-fluid hydrostatic pressure = 1 mm Hg
Interstitial-fluid osmotic pressure = 0 mm Hg |
|
Definition
| Bulk flow will occur into the capillaries with a net inward pressure of 3 mm Hg |
|
|
Term
| Which of the following statements concerning bulk flow in the capillaries is correct? |
|
Definition
| Bulk flow occurs by ultrafiltration at the arteriole end of the capillaries and by reabsorption at the venule end of the capillaries |
|
|
Term
| Decreased _______permeability of nodal cells depolarizes the SA node |
|
Definition
|
|
Term
| As the total cross-sectional area of the vascular tree_______, the velocity of blood flow________. |
|
Definition
|
|
Term
| A functional syncytium of cardiac muscle cells means that they |
|
Definition
| work as a functional unit mechanically and electically |
|
|
Term
| The semilunar pulmonary valve |
|
Definition
| prevents the backflow of blood into the right ventricle during ventricular diastole |
|
|
Term
| An insufficient or leaky AV valve |
|
Definition
| fails to close completely |
|
|
Term
| Which of the following is a characteristic associated with arterioles? |
|
Definition
| are the primary vessels involved with adjusting total peripheral resistance and mean arterial pressure (MAP) |
|
|
Term
| Which of the following is a characteristic of smooth muscle? |
|
Definition
|
|
Term
| The refractory period of cardiac muscle |
|
Definition
|
|
Term
Indicate which is the proper sequence of blood flow through the circulatory system
1. right atrium 6. pulmonary vein
2. left atrium 7. lungs
3. right ventricle 8. systemic tissues
4. left ventricle 9. aorta
5. pulmonary artery 10. venae cavae |
|
Definition
|
|
Term
| Which of the following is the correct relationship between pressure, flow, and resistance? |
|
Definition
flow = Pressure gradient
resistance |
|
|
Term
| Which of the following cause arteriolar vasodilation? |
|
Definition
|
|
Term
| The plateau of the cardiac action potential in contractile cells results from the opening of voltage-gated slow ________channels in the plasma membrane of the cardiac cell |
|
Definition
|
|
Term
| The sinoatrial (SA) node is teh heart's normal pacemaker because |
|
Definition
| it has the fastest natural rate of autorhythmicity |
|
|
Term
| Resistance in blood vessels increase when |
|
Definition
|
|
Term
| If the cardiac output is 4,900 ml/min and the heart rate is 70 beats per minute, the stroke volume averages ________ml. |
|
Definition
|
|
Term
| The p wave inan ECG (electrocardiogram) represents |
|
Definition
| depolarization of the atria |
|
|
Term
| Increased fluid in the capillaries ______plasma hydrostatic pressure |
|
Definition
|
|
Term
| Increased heart rate ______cardiac output |
|
Definition
|
|
Term
| Increased sympathetic nerve activity_______the strenght of cardiac ventricular contraction |
|
Definition
|
|
Term
| Increased sympathetic activation of the skeletal muscle arterioles_______the rate of blood flow |
|
Definition
|
|
Term
| Decreased sympathetic nerve activity______the arteriolar radius |
|
Definition
|
|
Term
| Decreased stroke volume _____cardiac output |
|
Definition
|
|
Term
| Increased total peripheral resistance ______the mean systemic arteriolar blood pressure |
|
Definition
|
|
Term
| Increased arteriolar radius ______the total peripheral resistance |
|
Definition
|
|
Term
| Contains intercalated discs |
|
Definition
|
|
Term
| Behaves as a functional syncytium |
|
Definition
| single-unit and cardiac muscle only |
|
|
Term
| Calcium is required for contraction to occur |
|
Definition
| single-unit, multi-unit, and cardiac muscle |
|
|
Term
|
Definition
| multi-unit smooth muscle only |
|
|
Term
| Is found in teh iris muscles |
|
Definition
| multi-unit smooth muscle only |
|
|
Term
| Muscle fibers contract according to the sliding filament mechanism |
|
Definition
| single-unit, multi-unit, and cardiac muscle |
|
|
Term
| Is found in the walls of most vessels in the body |
|
Definition
| single-unit smooth muscle only |
|
|
Term
| Is innervated by the autonomic nervous system |
|
Definition
| single-unit, multi-unit, and cardiac muscle |
|
|
Term
| Contains actin, myosin, troponin, and tropomyosin |
|
Definition
|
|
