Lab 3 [Heart] Flashcards
On the actual sheep heart, whats the names of the 3 vena cave from left to right?
Left Anterior VC.
Posterior VC
Right VC
Human superior = sheep _____
Anterior
Human anterior / ventral is sheep _____
Ventral
5 ways to tell if ventral
Apex Creamy fibres Angle of sulcus Curved Auricles point ventrally (dog ears)
3 ways to tell if dorsal view
Floppy purple veins
Vertical sulcus
Flat curvature
What is the ligamentum arteriosum?
Fiborous bridge linking the pul trunk to the aorta
How do you tell the left ventricle apart from the right ventricle
LV has trabeculae muscles which are like camel humps, and papillary muscles which are like bigger humps in the opening
What is the moderator band? Where + function?
Across right ventricle from wall to wall. Colour and texture show that it’s made of muscle not CT. Contains purkinje Fibres. Gets them ‘ready.’
What does the aortic valve look like?
It has coronary ostea in the LV aortic valve where O2 rich blood falls into.
Where are the cardiac veins? Function?
Small tiny openings that drain into the right atrium. DeO2 from heart to RA.
What is the oval shaped translucent membrane in fetal and humans? Where is it found?
Foramen ovale fetal
Fossa ovalis adult
Interventricular septum between atriums
Describe blood flow prenatal
From mum goes through systemic capillaries into right atrium, through right ventricle, pul. Trunk and ductus arteriosus. Some also went through to the lungs and aorta.
Describe blood flow postnatal
DeO2 from systemic to RIGHTS to lungs. O2 from lungs to LEFTS to systemic again.
Describe where the pul trunk and aorta are on your drawing and the bridge between them
Aorta has 2 openings
Brachiocephalic branch (arms and head).
Pulmonary trunk beside it on the ‘left’
Bridge is ligamentum arteriosum (former ductus arteriosus)
Coronary sinus
Collection of veins that carry DeO2 from heart to RA
What happens if the ductus arteriosus fails to close?
Greater blood flow to lungs than to the systemic circuit because systemic has more pressure. So it builds up then gets pushed to lungs circuit which has low resistance.
Blood pressure of LV varies from ___ to ____
0 to 120
Aorta BP range
80-120
Ductus arteriosus carries blood from the ___ to the ____.
Pulmonary trunk to the aorta
At birth the foramen ovale closes because ________
Heaps of blood goes back into the pul circuit (thanks to the ligamentum art.) so the LA fills up and pushes the flap closed.
The ductus arteriosum closes due to ____
Vasoconstriction of smooth muscle.
If the ductus arteriosum remained open there would be a shunt of blood from _____ to ____. This means ___ blood will reach the lungs
Aorta
Pul trunk
More
After blood has passed through the coronary arteries, it returns to the ___ through the ____.
Left anterior vena cava
Cardiac veins
