209 Chapter 11 The Cardiovascular System 6. Figure 11-4 is a diagram of the fron

Question

209 Chapter 11 The Cardiovascular System 6. Figure 11-4 is a diagram of the frontal section of the heart instructions below to complete this exercise Follow the First, draw arrows to indicate the direction Draw the pathway of the b the of blood flow through the heart. pathway of o t oxygen-rich blood with red arrows, and trace y xygen-poor blood with blue arrows. Second, identify each of the elements of the intrinsic conduction system numbers 1-5 on the figure) by inserting the appropriate terms in blanks left of the figure. Then, indicate with green arrows the pathway that impulses take through this system. Third, correctly identify each of the heart valves (numbers 6-9 on the figure) by inserting the appropriate terms in the blanks left of the figure, and draw in and identify by name the cordlike structures that anchor the laps of the atrioventricular (AV) valves. Fourth, use the numbers from the figure to identify the structures described below. Place the numbers in the lettered answer blanks B. Prevent backlow into the ventricles when the heart is relaxed -C. Prevent backflow into the atra when the ventricles are contracting D. _ E. AV valve with three flaps AV valve with two flaps conduction system G. The pacemaker of the intrirnsic Figure 11-4 H The point in the intrinsic conduction system where the impulse is temporarily delayed Aorta Pulmonary runk 1. vena cava Left atrium 3. 6. Wall of left ventricle 7. 9 vena cava

Explanation / Answer

1) Sino-atrial node

2)Atrioventricular junction node

3) bundle of His

4) Left and Right branches of bundle of His

5) Purkinje system

6) Semilunar valves at opening of pulmonary artery

7) Semilunar valves at opening of aorta

8) Bicuspid valve or Mitral valve

9) Tricuspid valves

Now the fourth question

A-6 ,B-7 ,C-8 ,D-9, E-9, F-8, G-1, H-2

Oxygenated blood from lungs comes in left atrium and deoxygenated blood from body comes in right atrium and then pumped to ventricles to pump to body organs by left ventricles by aorta and to lungs by pulmonary artery.

Impulse gets generated in Sino- atrial node transmitted to AV node then toh bundle of his spreads to wall of ventricle via purkinje fibres.

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