What is the primary function of coronary arteries in the heart?

A. Touch: Touch is a general sense detected by mechanoreceptors distributed throughout the body. It provides information about pressure, vibration, and texture, and does not require specialized organs.

B. Smell: Smell is a special sense mediated by olfactory receptors in the nasal cavity, requiring a specialized organ for detection.

C. Hearing: Hearing is a special sense detected by the cochlea in the inner ear, which is specialized for auditory perception.

D. Vision: Vision is a special sense mediated by photoreceptors in the retina of the eyes, requiring a highly specialized organ.

A. It is found only in the gut: While the gut harbors a large portion of the microbiome, microorganisms also inhabit the skin, oral cavity, respiratory tract, and urogenital tract.

B. It remains constant throughout a person's life: The microbiome is dynamic and can change due to diet, environment, medications, age, and illness, showing considerable variability over time.

C. It includes bacteria, viruses, fungi, and other microorganisms: The human microbiome is composed of a diverse array of microorganisms, including bacteria, viruses, fungi, and protozoa, all of which interact with the host and each other to influence health.

D. It consists of a single type of bacteria: The microbiome is highly diverse; a single bacterial species cannot represent its complexity or functional roles.