Practical 1

By the end of the lesson you should be able to: Name the four chambers of the heart. State the position and purpose of the heart

valves. Name all the blood vessels associated with the

heart. Explain why one side of the heart is thicker than

the other. Describe the path of blood flow through the

heart and the blood vessels around it

The human heart is a very simple but very efficient _____ beating over 100000 times a day. The four chambers, four valves and various blood vessels transport _______ into and out of the heart

pump

blood

To observe, identify and describe structures of a mammalian heart

Your teacher will either demonstrate or show you a video of how to dissect a mammalian heart.

Try to identify the following structuresBlood vessels Chambers Valves

coronary right atrium semilunar

aorta left atrium atrioventricular

Vena cava right ventricle

Pulmonary artery

Pulmonary vein

left ventricle

Finds the answers to the following questions and record your answers in the results section

What is the hard cream coloured tissue on the surface of the heart?

What colour is the tissue which makes up the walls of the heart.

How many times thicker is the wall of the left ventricle than the right ventricle.

Where are the coronary blood vessels? What is the name of the blood vessel with

the thickest wall? Which type of blood vessel has an elastic

wall? How would you describe the heart valves? What holds the valves open?

The hard cream coloured tissue on the surface of the heart is ___

The colour of the tissue which makes up the walls of the heart is _____

The wall of the ventricle is ________times thicker than the right ventricle

The coronary blood vessels are _____________ The blood vessel with the thickest wall is

called the ____________ The type of blood vessel with an elastic wall

is an ____________ Heart valves are ___________________ The heart valves are

_________________________

Observations

FAT

red2 to 3

On the surface of the heart

Aorta

Arterythin flaps of tissueheld open by

tendons

What is seen and done in this experiment?

Structure of a mammalian heart are observed, identified and described

What precautions are taken when carrying out dissections?

Gloves are worn to avoid contamination Care is taken handling sharp instruments Sensitivity is shown to those who find

dissection distasteful