Blog

Parasympathetic control of the heart via the vagus nerve is the primary mechanism that regulates beat-to-beat control of heart rate. Neurotransmitter released by vagus nerve is (1) Adrenaline (2) Acetyl […]

Thyroid hormone (T3) increases the heart rate and the force of contraction of cardiac muscles. The mechanisms of these effects of T3 have been explained by a researcher in the […]

The following statements were proposed by a researcher on the characteristic features of stretch receptors in atria and the effect of these receptors’ activity on blood pressure regulation: A. The […]

The arterial pressure usually raises and falls 4 to 6 mm Hg in a wave like manner causing “respiratory waves”. The probable mechanism of these waves has been proposed in […]

The heart rate shows variation during respiratory rhythm in most human subjects. Which one of the following statements describing the changes of heart rate during respiratory phases is true? (1) […]

An isolated carotid sinus was prepared so that the pressure may be regulated by a pump and the resulting discharge in single carotid sinus nerve fibre could be recorded. The […]

19. The discharge patterns in a single afferent nerve fibre from carotid sinus at various levels of mean arterial pressure (MAP) are plotted against changes in aortic pressure with time […]

The activities of baroreceptors present in the carotid sinus are carried by the afferent fibers of neurons located in (1) nodose ganglion (2) geniculate ganglion (3) petrosal ganglion (4) spiral […]

Which one of the following does NOT occur due to stimulation of baroreceptors? (1) Bradycardia (2) Hypotension (3) Venodialation (4) Vasoconstriction   What Happens When Baroreceptors Are Stimulated? Baroreceptors are […]

Which one of the following changes will occur in the cell membrane of nodal tissue of heart, which results in an increased heart rate due to stimulation of sympathetic nerves? […]