Which statement about stroke volume (SV) is false: an increase in venous refers

Question

Which statement about stroke volume (SV) is false: an increase in venous refers to the heart will cause a decrease in to myosin crossbridging in myocytes the release of acetylcholine on the heart will cause myocytes to contract with less force an increase in arterial pressure to above 160mmHg will cause a decrease in SV the drug digitalis increases the intracellular concentration of calcium, thereby increasing contractility and SV the physical stretching of cardiac myocytes causes myocytes to contract with more force if a grizzly bear escapes from the Bronx Zoo and attacks you on the sidewalk, you cardiovascular system would: show an increase in potassium permeability in the sino-atrial cells experience a large decrease in epinephrine released from the adrenal medulla respond by depolarizing the neurons in the sino-atrial node respond by causing a massive activation of the cholinergic muscarinic receptors on the SA node respond by decreasing sympathetic pre-ganglionic nerve activity going to the heart Which statement about the neuronal action potential is true: at threshold, the sodium inactivation gate closes and then the sodium activation gate opens first there is an outflow of potassium, followed by an inflow of sodium the drug physostigmine blocks the opening of the voltage-gated sodium channel the potassium activation gate is slower to move than the sodium activation gate the movement of sodium into the cells causes a rapid repolarization Which statement about the role of calcium ions in skeletal muscle concentration is false calcium is actively transported out of the muscle cell and out of the sarcoplasmic reticulum calcium binds to troponin to cause a conformational change in tropomyosin in the motor neuron, calcium causes synaptic vesicles to go through exocytosis when the dihydropyridine-ryanodine channel opens, calcium leaves the sarcoplasmic reticulum calcium present in the sarcomere causes myosin-to-actin cross-bridging Which of the following causes depolarization in neurons: Chemically-gated channels that cause a closing of chloride channels the electrogenic sodium/potassium ATPase pump voltage-gated potassium channels passive potassium channels inhibitory chemically-gated channels Which statement about excitatory chemically-gated channels on dendrites is true: the depolarization on the dendrite has a greater effect than a similar depolarization on the soma there is reduced resistance to the flow of sodium ions along the dendrite compared to the soma the resistance to ion flow inside dendrites is low because dendrites are thin excitatory chemically-gated channels on the dendrites allow the inward diffusion of sodium ions depolarizations are weakened because the dendrites are very leaky to calcium Which of the following will cause a decrease in cardiac stroke volume: an increase in venous blood return to the heart a stretching of the cardiac myocytes an injection of norepinephrine that increases arterial pressure to 180 mmHg an increase in sympathetic nerve activity to the heart a large caffeine dose following consumption of 5 energy drinks

Explanation / Answer

7.A ( It actually increases the cross bridge in between myocytes.

8.D It increase the sympathetic activity.

9. B 10. C

13. C

11. D

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