Which Structure Is the Primary or Natural Pacemaker of the Heart

question 24

Multiple Choice

Which structure is the primary or natural pacemaker of the heart?

• A) Ventricular tissue
• B) Atrioventricular node
• C) Sinoatrial node
• D) Purkinje fibers

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Definitions:

Contrast Medium

A substance used in medical imaging to highlight structures or fluids within the body, improving the contrast and detail of images like X-rays or MRIs.

Pelvic Exam

A physical examination of a woman's reproductive organs, including the vagina, cervix, uterus, fallopian tubes, and ovaries.

Vaginal Opening

The external opening of the vagina, connecting the external genitals to the internal reproductive organs.

Cervix

The lower part of the uterus that opens into the vagina, playing a key role in menstruation, childbirth, and sexual health.