Circulatory System Flashcards
What type of heart has pacemakers?
myogenic/autogenic
What is the thickest layer of the heart wall?
myocardium
What heart layer is the trabeculae carneae found?
endocardium
In agnathans, where must the blood go through before entering the atrium?
sinus venosus
In teleost, what serves as the pacemaker of the heart?
sinus venosus
What kind of arteriole does a teleost have?
bulbus arteriole
Describe the chambers of a frog’s heart.
2 atria + 1 ventricle
What kind of circuit does an amphibian have?
dual systemic circuit
In a reptilian heart, the interventricular septum is incomplete, what is the implication?
blood can mix
Oxygenated blood is contained in which area of a reptilian heart?
left systemic aorta
In a crocodile, the interventricular septum is complete but the mixing of blood still happens. Why?
because of the foramen of panizza
What connects the right and left atria?
foramen ovale
What connects the aorta and pulmonary artery?
ductus arteriosus
When someone says “may butas sa puso”, what structure are they referring to?
foramen ovale. it didn’t fully close at birth
Umbilical vein becomes what after birth?
ligamentum teres
What is the function of the sinoatrial node of the heart?
pacemaker; mass of excitable tissue
Where is the sinoatrial node located?
apex of the heart
A shark has how many aortic arches?
6
What is the 3rd aortic arch?
carotid arch
What is the 4th carotid arch?
systemic arch
What is the 6th aortic arch?
pulmonary arch
The cardinal stream drains what?
head, dorsa body wall, kidney
The abdominal stream drains what?
ventral body wall + paired appendages
What stream brings blood to the liver?
hepatic portal stream
What stream brings blood to the kidney?
renal portal stream
Where does lymph eventually drain into?
venous system
What is the function of the primary lymphoid organ?
production of lymphocyte
What is the function of the secondary lymphoid organ?
site of differentiation, maturation, and activation of lymphocyte
small masses of lymphatic tissue located in the lining of the small intestine, primarily in the ileum
Peyer’s patches
