Lab 3 [Heart]

Question 1

On the actual sheep heart, whats the names of the 3 vena cave from left to right?

Answer 1

Left Anterior VC.
Posterior VC
Right VC

Question 2

Human superior = sheep _____

Answer 2

Anterior

Question 3

Human anterior / ventral is sheep _____

Answer 3

Ventral

Question 4

5 ways to tell if ventral

Answer 4

Apex
Creamy fibres
Angle of sulcus
Curved 
Auricles point ventrally (dog ears)

Question 5

3 ways to tell if dorsal view

Answer 5

Floppy purple veins
Vertical sulcus
Flat curvature

Question 6

What is the ligamentum arteriosum?

Answer 6

Fiborous bridge linking the pul trunk to the aorta

Question 7

How do you tell the left ventricle apart from the right ventricle

Answer 7

LV has trabeculae muscles which are like camel humps, and papillary muscles which are like bigger humps in the opening

Question 8

What is the moderator band? Where + function?

Answer 8

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.’

Question 9

What does the aortic valve look like?

Answer 9

It has coronary ostea in the LV aortic valve where O2 rich blood falls into.

Question 10

Where are the cardiac veins? Function?

Answer 10

Small tiny openings that drain into the right atrium. DeO2 from heart to RA.

Question 11

What is the oval shaped translucent membrane in fetal and humans? Where is it found?

Answer 11

Foramen ovale fetal
Fossa ovalis adult

Interventricular septum between atriums

Question 12

Describe blood flow prenatal

Answer 12

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.

Question 13

Describe blood flow postnatal

Answer 13

DeO2 from systemic to RIGHTS to lungs. O2 from lungs to LEFTS to systemic again.

Question 14

Describe where the pul trunk and aorta are on your drawing and the bridge between them

Answer 14

Aorta has 2 openings
Brachiocephalic branch (arms and head).
Pulmonary trunk beside it on the ‘left’
Bridge is ligamentum arteriosum (former ductus arteriosus)

Question 15

Coronary sinus

Answer 15

Collection of veins that carry DeO2 from heart to RA

Question 16

What happens if the ductus arteriosus fails to close?

Answer 16

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.

Question 17

Blood pressure of LV varies from ___ to ____

Answer 17

0 to 120

Question 18

Aorta BP range

Answer 18

80-120

Question 19

Ductus arteriosus carries blood from the ___ to the ____.

Answer 19

Pulmonary trunk to the aorta

Question 20

At birth the foramen ovale closes because ________

Answer 20

Heaps of blood goes back into the pul circuit (thanks to the ligamentum art.) so the LA fills up and pushes the flap closed.

Question 21

The ductus arteriosum closes due to ____

Answer 21

Vasoconstriction of smooth muscle.

Question 22

If the ductus arteriosum remained open there would be a shunt of blood from _____ to ____. This means ___ blood will reach the lungs

Answer 22

Aorta
Pul trunk
More

Question 23

After blood has passed through the coronary arteries, it returns to the ___ through the ____.

Answer 23

Left anterior vena cava

Cardiac veins