True or false
The heart is located in the mediastrinum slightly to the left ofthe midline with an anterior left ventricle and posterior rightventricle.
Pacemaker cells form the AV nodes and lack a distinct plateauphase.
The heart consists of two superior ventricles, two AV valves,two inferior atria and two aortic semilunar valves.
Lymph from the lower limbs drains into the right lymphaticduct.
Cardiac cells are joined to one another by intercalated discsthat contain gap junctions for depolarization between cells anddesmosomes to hold the fibers together when the heartcontracts.
The ventricular ejection phase generally correlates with the S-Tsegment and the T wave on the ECG.
Lymphatic vessels constitute a one-way system that deliversfluid form the blood vessels to the extracellular space
Systole is the contraction portion of the cardiac cycle anddiastole is the relaxation portion.
There are typically four pulmonary veins, two draining eachlung. They all connect to right atrium.
The sympathetic nervous system increases blood pressure in theshort term by increasingcardiac______output¬¬¬¬¬____and___bloodpressure.
The rapid depolarization phase of the contractile cell actionpotential is due to the opening of voltage-gated potassium ionchannels.
The buffy coat is the fraction of an anticoagulated blood samplethat contains most of the leukocytes and thrombocytes.
Erythrocytes are biconcave discs with prominent nuclei. The mainfunction of erythrocytes is to transport O2 on the moleculehemoglobin.
The plateau phase in cardiac cell is due to the influx of calciumions through calcium ion channels
The amount of blood in the ventricles at the end of the ventricularfilling phase is the end –systolic volume
The first branch of the aortic arch is the brachiocephalicartery, which divides into the left common carotid artery and theleft subclavian artery.
Tissue perfusion to the heart decreases during systole andincreases during diastole
Atrial systole is responsible for ejecting most of the bloodinto ventricles during the ventricular filling phase of the cardiaccycle
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During heart transplant surgery, an electric shock is sometimesneeded to make the donor heart beat properly because the electricshock activates the sympathetic nerve fibers in the ventricles.
People with type AB- (negative) blood are universal recipientsbecause they have no antibodies to A, B or Rh in their blood andcan receive red blood cells from a donor of any bloodtype.
