Falling for You
Closed and continuous, circulating the flow,
Cardiology’s the study where the health stats show.
Mediastinum, pericardial space,
Three hundred grams in a closed fist’s place.
Base at the top where it’s wide and clear,
Apex at the bottom on the left right here.
Endocardium smooth on the inner wall,
Myocardium pumping through the rise and fall,
Fed by coronary arteries keeping muscle strong,
Epicardium layer where the outer parts belong.
Circulation,
keep the system alive!
Two distinct circuits helping body cells thrive.
Pulmonary on the right side taking blood to the lungs,
Systemic on the left side where the main engine runs.
Unidirectional valves keep the flow moving right,
From the atria to ventricles,
day and night.
Four main chambers: two atria on top,
Right atrium takes the highest volume without a stop.
Interatrial septum keeps the two sides neat,
Interventricular septum
down below where they beat.
Left ventricle works hardest pushing blood out fast,
Papillary and chordae tendineae
holding valves to the last.
Tricuspid on the right,
bicuspid on the left,
Pulmonary semilunar stops reflux and theft.
Aortic semilunar in the
aortic root,
Sending oxygenated blood on a body-wide route.
Arteries carry blood away from the heart,
Creamy, thick-walled, deep right from the start.
High pressure, high oxygen,
noted in red,
Tunica media is thickest in the vessel bed.
Capillaries in the middle where the gas gets swapped,
In the vaso vasorum where the flow isn't stopped.
Veins carry blood back with unidirectional valves,
Superficial, thin-walled, low pressure that solves.
Vena cava pairs with the
aorta supreme, Except the Great Saphenous—longest vein in the scheme!
Linear guides are lines drawn on top of the skin,
Sternoclavicular to ear for carotids to begin.
Anatomical guides show position near a muscle or bone,
Like the brachial behind biceps in a medial zone.
Anatomical limits mark the origin and end,
First rib to teres major where axillaries bend.
From the aortic arch branches to the subclavian bound,
That’s the vascular system—closed,
continuous, and sound!