Which describes the arteries that ascend up the brainstem? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Two common carotid arteries which branch off as the external carotid artery b Two common carotid arteries which branch off as the internal carotid artery Two basilar arteries which converge as the vertebral artery d Two basilar arteries which converge as the superior cerebellar artery e Two vertebral arteries which converge as the basilar artery

Fill in the blank:  Endings of sympathetic nerve fibers secrete _______________________, which causes the heart rate to increase.

Select the correct answer for each question.  Explain why you chose that answer as opposed to the others.  In other words, explain why the other choices are incorrect. If the vagal nerves to the heart were cut, the result would be that _____. The heart rate would increase by about 25 beats per minute. Parasympathetic stimulation would increase, causing a decrease in heart rate. The heart would stop, since the vagal nerves trigger the heart to contract. Pacemaker cells would cease to spontaneously depolarize.

please fill in the blanks Does the internal carotid artery run deeper to or more superficial to the external carotid artery? A._____________________________ What important organ in the head does the internal carotid arterysupply with blood? B.___________________________ We now return to the right subclavian artery as it continues into the upper arm.  Trace the subclavian, noting that near the first rib it becomes the A.________________________artery.    As this artery continues into the upper arm, it, in turn, becomes the B.____________________ artery.  This particular artery is used clinically to monitor what important vital sign? C._________________________________   (Note the subclavian, axillary and brachial arteries are all the same vessel: the name of the vessel changes as it moves to new areas in the body.)   In the antecubital region the brachial artery branches into two smaller vessel, named after the bones of the lower arm.  These are the D.___________________…

If you consider the anterior interventricular artery if a thrombus forms in the artery, which area of the heart would most likely experience infarct? a. the left ventricle and interventricular septum b.  the right atrium c.  the right ventricle

Harold had a mild stroke due to a blockage in his posterior communicating artery. He fully recovered because he got to the hospital within on hour. The neurologist states the his quick recovery was also due to the fact that this artery was part of the circle of Willis. What is circle of Willis and why the doctor say this ? Include anatomical structure in your explanation

Using the ECG recording provided below, how do we know that this extrasystole event (i.e., indicated by the arrow) is occurring in the ventricles and not the atria?  a. None of the options are correct b. Extrasystole event is smaller in amplitude than the QRS complex c.Event occurs after a T-wave d.Large ECG amplitude compared with the P-wave e.Event occurs after a P-wave

The Lumbar artery is a:     A. Visceral branch of the aorta     B. Parietal branch of the aorta     C. Not a branch of the aorta     D. Terminal branch of the aorta