?? ?.unit 06 Lecture Quiz: BIO-173xYB] unit 08 Lectur nect Home Quiz: unit 09 Le
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?? ?.unit 06 Lecture Quiz: BIO-173xYB] unit 08 Lectur nect Home Quiz: unit 09 Lecture Exam https:/liowacconline.instructure.com/courses/17981/quizzes/150189/take D Question 5 The structure which is the pacemaker of the heart is the O bundle of HIS O SA node O AV node DQuestion 6 Nitric axide is common given as a rapid and powerful vasoconstrictor. 0 True False D Question 7 The longer a blood vessel, the greater the resistance encountered by blood traveling through it. True O Fale D Question 8 Referring to the EKG: The beginning of atrial excitation to the beginning of ventricular excitation is recorded by the O S-T segment O Q-T Interval Question 9Explanation / Answer
Answer 5. Option SA node
The electrical impulse originates at the SA node, thus it is known as the pacemaker of the heart. It is located near the right atrium.
Answer 6. False
Nitric oxide is a powerful chemical that results in the relaxation of the afferent arteriole, thus helping out in vasodilation.
Answer 7. True
The greater the length of the vessel and the smaller the diameter of the blood vessel the greater the resistance encountered by blood travelling through it.
Answer 8. P-R interval
It is the time period that extends between the beginning of the P wave until the beginning of the QRS complex.
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