Heart Dissection Lab
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School
Pikes Peak Community College *
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Course
2102
Subject
Anatomy
Date
Jan 9, 2024
Type
Pages
6
Uploaded by josmames
1
©2014, Carolina Biological Supply Company
Mammalian Heart Dissection Answer Sheet
Pulmonary
Trunk
Right Ventricle
Interventricular
Sulcus
Left Atrium
Atrial Appendage
Apex
Left Ventricle
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©2014, Carolina Biological Supply Company
Mammalian Heart Dissection Answer Sheet
Superior Vena
Cava
Right Atrium
Coronary Sulcus
Pulmonary
Veins
Inferior
Vena Cava
Inderior Vena
Cava
Aorta
Left Common
Carotid Artery
Brachiocephal
ic Trunk
Pulmonary
Artery
Left Subclavian
Artery
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©2014, Carolina Biological Supply Company
Mammalian Heart Dissection Answer Sheet
Right Ventricle
Left Ventricle
Chordae Tendineae
Aortic Valve
Bicuspid Valve
Intraventricular
Septum
Papillary Muscles
Trabeculae Carneae
Tricuspid Valve
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4
©2014, Carolina Biological Supply Company
Mammalian Heart Dissection Answer Sheet
Observations
External Observations of the Heart
Insert a photograph of the heart in the correct anatomical position (as described in
your lab manual).
Identify the apex and the planes of the heart in your photo.
Refer to the front of the dissection mat to identify the external features and orient your
heart.
Insert a photograph of the large vessels of the heart here. Include a caption that
identifies each vessel.
(Crayons make great vessel identifiers.
Stick a crayon in each
vessel and identify that vessel by the crayon color [
dispose of the crayons when you’re
done
]).
Refer to the front of the dissection mat to find those vessels.
Insert a photograph of the heart with the external structures identified as listed in your
Lab Manual Activity 1, Step 2.
(You may include a caption noting the structures and
identify their locations in the photo)
Refer to the front of the dissection mat to find those structures.
Internal Observations of the Heart
Insert your photograph of the interior view of the heart. Label each of the structures
listed in Activity 1, Step 4 of your lab manual.
You may identify them in a caption and
identify their locations in the photo.
Refer to the front of the dissection mat to find those structures.
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©2014, Carolina Biological Supply Company
Mammalian Heart Dissection Answer Sheet
Questions
1.
Which of the four heart chambers has the thickest myocardium? Why?
The chamber with the thickest myocardium is the Left Ventricle. This is because the left
ventricle sends out the blood to the furthest parts of the body, so this chamber needs a
lot of muscle to squeeze the blood to get there.
2.
Mitral valve prolapse (MVP) is a medical condition characterized by symptoms such
as dizziness, fatigue, and shortness of breath. What causes these symptoms?
These symptoms are caused by the valve not closing after the left atrium pushes the
blood to the left ventricle. This results in the blood flowing back into the left atrium and
being unable to fully circulate the oxygenated blood throughout the body.
3.
In thls lab, we looked at the anatomy of the heart.
We have also been discussing
cardiac physiology.
Differentiate between anatomy of the heart and the
physiology of the heart.
What is an example of an anatomic structure in the heart?
Elaborate about how that structure allows the heart to work the way that it does.
The anatomy of the heart is that it contains 4 chambers and contains multiple vessels
that allow blood to travel into, around, and out of it. The physiology is that the different
myocardiums surrounding the different chambers continuously contract in order to push
the blood into the next chamber until it leaves the heart to travel around the body.
An example of an anatomic structure of the heart is the biscuspid valve. The bicuspid
valve is in place to prevent the blood from flowing backwards into the left atrium after it
has already left.
4.
Look at the ECG Abnormalities graphs in Figure 19.25 on page 862 of your textbook.
Choose one of those abnormalities and sketch the ECG pattern below:
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©2014, Carolina Biological Supply Company
Mammalian Heart Dissection Answer Sheet
Label each wave on your sketch and identify the heart structure that is responsible
for that part of the wave.
Either insert a copy of your internal heart dissection photo
or sketch the interior structure of the heart below and indicate on that photo or
sketch where each structure is that causes each part of your abnormal wave.
Depolarization of
Ventricles – Responsible
for QRS complex
Repolarization of
Ventricles – Responsible
for T wave
Depolarization of Atria –
Responsible for P wave
The constant, incomplete contraction of the atria is what is causing
the ECG pattern to appear to have multiple P and/or T waves.
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