25. The SA node sets a heart rate of approximately a. 80 beats per minute b. 90

Question

25. The SA node sets a heart rate of approximately a. 80 beats per minute b. 90 beats per minute c. 100 beats per minute d. 110 beats per minute 26. Which of the following is true of the bulbus cordis? a. it develops into the right ventricle b. It develops into the left ventricle c. It forms the auricles and the atria d. It develops into the ascending aorta and pulmonary trunk 27. An anastomosis is... a. b. c. d. An artery that travels the entire length of an organ An artery which ends at an organ The union of branches of two or more arteries supplying the same body region An abundant microscopic vessel that flows into a capiliary 28. Where would one find vaso vasorum? a. Tunica interna b. Tunica media c. Tunica externa d. Connective tissue 29. Parasympathetic stimulation of the heart is caused by a. Cranial nerve X b. Cranial nerve V c. Cranial nerve II d. Cranial Nerve 30. Nerve impulses from the carotid sinus propagate through the in order to reach the medulla. a. b. c. d. Vagus nerve Glossopharyngeal nerve Cardiac accelerator nerves Renin-angiotensin-aldosterone system

Explanation / Answer

25.(a) 80beats per minute

Heart rate depends on the rate at which the sinoatrial node produces action potentials. At rest, heart rate is between 60 and 100 beats per minute.so average rate 80 per minutes.

26. (b) give rise to left ventricle

busbus cordis develop into ventral ventricle.

27.(c)

anastomosis is a connection or opening between two things that are normally diverging or branching, such as between blood vessels or artries.

28..(d) connective tissue

found in large vein and arteries such as the aorta and its branches. These small vessels serve to provide blood supply and nourishment for tunica adventitia and outer parts of tunica media of large vessels.

29.(a) cranial X

cranial X (vagus nerve) exerts an inhibitory action on the heart as it slows conduction from the sinus node

30.(b) glossopharyngeal nerve

Nerve impulses propagate from the carotid sinus baroreceptors over sensory axons in the glossopharyngeal (IX)nerves to the cardiovascular center in the medulla.

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.