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Biology
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13 Dec 2019

5. During the isometric contraction phase of the cardiac cycle,

A both mitral and aortic valves are open.

B the mitral valve is open but the aortic valve is closed.

C the mitral valve is closed but the aortic valve is open.

D both mitral and aortic valves are closed.

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Trinidad Tremblay
Trinidad TremblayLv2
17 Dec 2019
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Related questions

1) The external layer of the heart wall is the

Multiple Choice

endocardium.

myocardium.

epicardium.

parietal pericardium.

2) Check all that are characteristics of cardiac muscle.

Check All That Apply

Cells are long and cylindrical.

Cells are short and branching.

Cells have multiple nuclei at the periphery of the cell.

Cells have one or two nuclei in the center of the cell.

They are composed of thick and thin filaments.

The functional contractile unit is the sarcomere.

3) Match the chamber of the heart with the structure(s) from which it receives blood.

Coronary sinus

Pulmonary veins

Right atrium

Left atrium

Match each of the options above to the items below.

Right atrium

Right atrium Open choices for matching

Right ventricle

Right ventricle Open choices for matching

Left atrium

Left atrium Open choices for matching

Left ventricle

4) The less extensive distribution of T-tubules contributes to the more delayed onset and prolonged contraction of cardiac muscle tissue compared to skeletal muscle tissue.

True or False

5) The cells of the ___________ act as the heart's pacemaker, which establishes the pace for cardiac activity.

Multiple Choice

atrioventricular (AV) node

sinoatrial (SA) node

atrioventricular (AV) bundle

Purkinje cells

6) Match the cardiac vein with its description.

Travels close to the right marginal artery

In posterior interventricular sulcus

In anterior interventricular sulcus

In the posterior portion of cornary sulcus

Match each of the options above to the items below.

Great cardiac vein

Great cardiac vein Open choices for matching

Middle cardiac vein

Middle cardiac vein Open choices for matching

Small cardiac vein

Small cardiac vein Open choices for matching

Coronary sinus

7) Parasympathetic innervation to the heart comes from the medulla oblongata via the left and right ___________ nerves.

8) Check all that are components of the sympathetic innervation of the heart.

Check All That Apply

Cervical sympathetic ganglionCervical sympathetic ganglion

Spinal cordSpinal cord

Vagus nerve (CN X)Vagus nerve (CN X)

Cardiac nerveCardiac nerve

Sympathetic postganglionic axon

9) Check all that occur during ventricular contraction.

Check All That Apply

The AV valves open to allow blood to enter the ventricles from the atria.The AV valves open to allow blood to enter the ventricles from the atria.

The semilunar valves remain closed to prevent backflow of blood into the ventricles.The semilunar valves remain closed to prevent backflow of blood into the ventricles.

The semilunar valves open to allow blood to flow into the large arteries.The semilunar valves open to allow blood to flow into the large arteries.

The AV valves close to prevent backflow of blood into the atria.

1) Check all that are components of the sympathetic innervation of the heart.

Check All That Apply

Cervical sympathetic ganglion

Spinal cord Spinal cord

Vagus nerve (CN X)

Cardiac nerve

Sympathetic postganglionic axon

2) Check all that occur during ventricular contraction.

Check All That Apply

The AV valves open to allow blood to enter the ventricles from the atria.

The semilunar valves remain closed to prevent backflow of blood into the ventricles.

The semilunar valves open to allow blood to flow into the large arteries.

The AV valves close to prevent backflow of blood into the atria.

3) Put the pattern of circulation into the correct order, beginning with the pulmonary circulation.

Blood enters the plumonary arteries and travels to the lungs.

Blood leaves the right side of the heart.

Blood enters the plmonary veins.

Blood enters the system arteries.

Blood delivers oxygen to the tissues, and then enters systematic veins.

Blood enters the left side of the heart.

4)Check all that are characteristics of cardiac muscle.

Check All That Apply

Cells are long and cylindrical.

Cells are short and branching.

Cells have multiple nuclei at the periphery of the cell.

Cells have one or two nuclei in the center of the cell.

They are composed of thick and thin filaments.

The functional contractile unit is the sarcomere.

I need to answer questions ( very specifically ) 1. What did each of the bottles represent? What does the water represent? 2. What circulatory system structure do the check valves represent? What is their function in the circulatory system? 3. What do you predict would have happened if there were no valves present in the model? How would this affect the human body? Experiment 3: Modeling the Circulatory System In this experiment you will explore and model the structures and function of the circulatory system. Procedure 1. Use the permanent marker to label the plastic bottles 1 and 2. 2. Use a nail to carefully puncture two holes in the side of each bottle (approximately 3.5 cm from the bottom of the bottle) so that the holes are across from each other and at the same height from the bottom of the bottle. It is best to puncture the bottle with the nail straight through both sides. This will help keep the holes level. LAB SAFETY: BE EXTREMELY CAREFUL WHEN PUNCTURING THE BOTTLE. KEEP IN MIND WHERE YOUR HANDS ARE AT ALL TIMES. 3. You may need to maneuver the nail around the hole to make it large enough to fit the plastic tubing (Figure 7). The goal is for the tubing to fit tightly in the hole. 2 Check Valves 2 Drops of Dye Nail Permanent Marker 2 Plastic Bottles 60 cm of Tubing *Scissors *Water *You Must Provide Materials Figure 7: Maneuver the nail in a circular motion to enlarge the hole so that the tubing fits tightly. 386 The Circulatory and Respiratory Systems 4. Carefully cut the 60 cm tubing into four equal lengths of 15 cm. 5. Attach one end of one piece of 15 cm tubing to the OUT end of a check valve. 6. Attach one end of a second piece of tubing to the IN end of the check valve. 7. Repeat Steps 3 and 4 for the remaining check valve. 8. Construct a closed system by inserting the free ends of the tubes into the holes you created in the plastic bottles to create a loop. The tubes should be far enough into the bottle so that water can flow from tube to bottle to tube. The tubes in each bottle should not touch (Figure 8). Note: Properly assembled models should have the direction of the check valves facing in opposite directions. 9. Fill each bottle ¾ with water. The water level should be higher than the tubing. 10. Place the model on an underpad or paper towel to protect surfaces for the next step. This will also help catch water that leaks from the model. There should be minimal leaking if tubes are tightly in the bottles. 11. Place one drop of dye in each bottle and close the bottle by screwing on the caps. 12. Gently swirl the bottles to allow dye and water to mix. Be careful not to squeeze the bottles! 13. Note where the water is initially before squeezing the bottles and record your observations in Table 2. 14. Squeeze bottle 1 with both hands. Observe the direction of water flow and the water level in each bottle while you are squeezing and right after you stop squeezing. Record your observations in Table 2. 15. Repeat Step 13 for the bottle 2 and record your observations. 16. Squeeze one bottle and then the other back and forth.

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