VNSA3 Heart lesson

A&P Recap - The Cardiovascular system

Can you label the anatomical features of the heart?

Remember that drawings of the heart are flipped on a horizontal axis - i.e. Right is left and left is right.

Atria are on top because A is pointing up ^ and Ventricles on the bottom because V is pointing down v

Hotspot

To demonstrate this, click on the right ventricle and the left atria

Hotspot

Now consider which chamber of the heart pumps the systemic blood flow. Pulmonary meaning to and from lungs, systemic meaning the rest of the body.

Labelling

Label valves and vessels

Drag labels to their correct position on the image

Mitral Valve

Pulmonary Veins

Aortic Valve

Pulmonary Artery

Aorta

Pulmonary Valve

Tricuspid Valve

Cranial Vena Cava

Caudal Vena Cava

Now consider the electrical activity of the heart.

Starting from the Sinoatrial Node in the wall of the right atrium (just like how the cycle of the heart starts at the right atrium) starts with the contraction of atria. Then to the AV node (between Atria and Ventricles).
This then travels via the bundle of his, to the Purkinje fibres in the walls of the ventricles causing them to contract.

Labelling

Label the conductive anatomy of the heart

Drag labels to their correct position on the image

Bundle of His

Atrioventricular (AV) Node

Purkinje fibres

Sinoatrial (SA) Node

The Avian Heart is very similar to the Mammalian heart. The reptilian heart is different in that it has 3 chambers. 2 Atria and 1 Ventricle. Just think of a love heart.

Reptile Heart

Multiple Choice

Which of the following is NOT a type of blood vessel?

• Artery

• Capillary

• Vein

• Ventricle

Multiple Choice

What is the function (job) of the platelets?

• To form clots (i.e. scabs) when you have cuts and grazes.

• To transport oxygen to the muscles

• To carry dissolved sugars.

• To produce antibodies

Multiple Choice

Which blood vessel has valves to prevent the back-flow of blood?

• Veins

• Arteries

• Capillaries

Multiple Choice

Arteries have thick muscular walls?

• true

• false

Multiple Choice

The blood vessel that has the largest diameter is

• vein

• artery

• capillary