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Zorluk: OrtaHuman Anatomy and Body Systems

Although the heart pumps oxygenated blood to all peripheral tissues and organs, the thick muscular walls of the myocardium cannot absorb oxygen directly from blood flowing through its internal chambers. Which blood vessels branch directly off the ascending aorta to supply the heart muscle tissue itself with oxygen and nutrients?

  1. A
    Carotid arteries
  2. Coronary arteriesCevap
  3. C
    Jugular veins
  4. D
    Subclavian veins

Cevap

Coronary arteries
The coronary arteries are the dedicated blood vessels branching off the root of the ascending aorta that encircle the heart and penetrate the myocardium to deliver oxygen-rich blood and vital nutrients to cardiac muscle cells.

Adım Adım Çözüm

1
Identify the metabolic requirements of heart tissue
The myocardium is thick, metabolically active muscular tissue that cannot rely on diffusion from luminal blood within the cardiac chambers.
Blood moving rapidly through the ventricles and atria cannot diffuse through the endocardium into the deep muscular layers.
2
Determine the vascular pathway supplying oxygenated blood to the cardiac muscle
The right and left coronary arteries branch directly from the base of the ascending aorta just superior to the aortic valve.
This anatomical arrangement ensures high-pressure, oxygen-rich blood perfuses the myocardial capillaries during ventricular diastole.

Anahtar Kavram

Coronary circulation and myocardial perfusion
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Human Anatomy and Body Systems

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