How does the baroreceptor reflex respond to an increased...

How does the baroreceptor reflex respond to an increased stretch of the carotid sinus/aortic arch? Inhibits sympathetic outflow and stimulates parasympathetic outflow Stimulates sympathetic outflow and inhibits parasympathetic outflow Increases blood volume No effect on sympathetic and parasympathetic outflow

Transcript

00:01 Hello students, in this video i will be answering two questions beginning with the first question that is question number 27.

00:08 Here we need to select all the correct statements regarding baroreceptor reflex.

00:14 First statement that is statement a is true when blood pressure increases the baroreceptors which are stretched receptors located in the walls of certain blood vessels are activated.

00:29 Baroreceptors send signals to the medulla oblongata in the brainstem in response to the increased signal from the baroreceptors the medulla decreases the activity of parasympathetic nerves that innervate the heart's pacemaker.

00:46 This results in decrease in frequency and conduction of pacemaker action potential leading to a decrease in heart rate.

00:55 This mechanism helps to regulate blood pressure therefore the statement a is correct.

01:04 Statement b is also correct.

01:08 Baroreceptor reflex involves sensory neurons that transmit information from the baroreceptor to the medulla oblongata in the brainstem.

01:19 The medulla acts as a control center that regulates autonomic innervations of the heart based on the information received from the baroreceptors.

01:28 The medulla can modulate activity of both parasympathetic and sympathetic nervous systems that innervate the heart adjusting the heart rate and contractility to maintain blood pressure within the normal range.

01:43 Option c is also correct but it is important to note that this may not be the immediate response.

01:52 Initially the baroreceptor reflex aims to counteract a change in blood pressure so it typically involves decrease in sympathetic stimulation and increase in parasympathetic stimulation leading to decrease in heart rate.

02:07 However, in certain situations prolonged activation of baroreceptor reflex can lead to a compensatory increase in sympathetic stimulation to restore blood pressure if it falls too low...

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