Which statement about the of is true: Digitals has all of the following effects

Question

Which statement about the of is true: Digitals has all of the following effects on if causes an increases in if causes increases in intracellular sodium levels if causes increases in intracellular calcium levels it shows the pumping of sodium/potassium ATPase if increases the pumping of the sodium/calcium secondary active pump What happens during nerve gas the gas blocks acetylcholine-esterase the gas blocks cholinergic receptor all of the calcium channels are blocked antibodies attach destroy the acetylcholine receptor the gas blocks reuptake of the transmitter the gas blocks the mouth of the voltage-gated sodium channel Which of the following is true about skeletal muscle contraction: an influx of sodium ions in the motor causes the synaptic vesicles to fuse the membrane calcium is actively transported into the sacroplasmic reticulum during muscle relaxation the binding of myosin to action causes myosin to release an attached calcium ion the addition of produces ever an over abundances of Ach in the synaptic cleft calcium blinds with tropomyasin to cause conformational change in trooping Which of these statements about the ECG is not true: during the T wave, both atria are contracting and emptying their blood into the ventricles during the QRS complex, the tricuspid and bicuspid valves are slapping shut the time between the P wave and QRS complex is created by the slow conduction velocity in the AV node during the P wave, there is no heart sound the ventricles are during the QRS complex Which statement about sympathetic and parasympathetic control of heart rate is false: sympathetic preganglionic nerve fibers release acetylcholine are their transmitter substance norepinephrine causes an increase in potassium permeability in SA nodal cells parasympathetic nerve cause a slowing of the heart rate by activating cholinergic muscarinic receptors acetylcholine causes a hyperpolarization on the sinoatrial nodal cells parasympathetic preganglionic nerve fibers release acetylcholine as their transmitter substance Which question about the heart valves is false: blood through the pulmonary semi lunar valve and into the pulmonary vein oxygenated blood goes through the mitral valve and into the left ventricle blood from the left ventricle goes through the aortic semi lunar valve into the aorta deoxygenated blood leaves the right atrium goes through the tricuspid valve the bicuspid valve is in oxygenated blood and the tricuspid valve is in deoxygenated blood When comparing a skeletal muscle cell to a cardiac muscle cell (myocyte), which is false: cardiac myocytes have gap junctions but skeletal muscle cells do not have these integral membrane protein both cardiac myocytes and skeletal muscle cells have voltage-gated potassium channels on their cell membrane both skeletal muscle cells and cardiac myocytes have a sarcoplasmic reticulum that has high calcium concentrate both skeletal muscle cells and cardiac myocytes have T-tubules that carry the action potential into the interior cardiac myocytes have dihydropyridine-ryanodine channels that release calcium from the sarcoplasmic Which of the following will increase cardiac output(remember: Co = HR times SV): an increase in parasympathetic nerve activity to the heart an increase in the permeability of sodium and calcium in senatorial nodal cells a very large increase in arterial pressure causing an increase in after load a decrease in venous return to the heart causing a decrease in stretching of the heart muscle adequate oxygenation of cardiac myoctes, causing a decrease in contractility

Explanation / Answer

17: There is influx of calcium ions which makes the synaptic vesicles to fuse with the membrane. During muscle contraction, calcium ions are pumped out of the sarcoplasm into the SR by ATP driven pump. Influx of calcium ion causes exposure of myosin binding sites on the actin filaments followed by binding to myosin heads to the actin to form the cross bridges. Presence of tetrodoxin reduces the Ach concentration in synaptic cleft. Calcium binds to troponin to make the conformational changes to move tropomyosin away from the myosin binding sites of actin. Option B is the correct answer.

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