Question: (A)- (B). (C). Body Cavities 6. Name The Muscle That Subdivides The Ventral Body Cavity. 7. Which Body Cavity Provides The
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6. Name the muscle that subdivides the ventral body cavity.
Answer: The diaphragm is the muscle that subdivides the ventral body cavity.
Explanation:
The ventral body cavity is one of the main cavities in the human body, housing essential organs within two primary subdivisions: the thoracic cavity (upper) and the abdominopelvic cavity (lower). The diaphragm is a dome-shaped skeletal muscle that separates these two cavities. This muscle plays a vital role in respiration, as it contracts and flattens to allow the lungs to expand during inhalation.
Structurally, the diaphragm attaches to the lower ribs, sternum, and lumbar vertebrae. It also features openings (hiatuses) that allow structures such as the esophagus, aorta, and inferior vena cava to pass between the thoracic and abdominal cavities. Beyond its role in breathing, the diaphragm helps maintain pressure differences between the thoracic and abdominopelvic cavities, which is crucial for proper organ function.
7. Which body cavity provides the most protection to internal organs?
Answer: The cranial cavity provides the most protection to internal organs.
Explanation:
The cranial cavity, located within the skull, houses and protects the brain. Unlike other body cavities, the cranial cavity is entirely encased in bone, offering superior protection against physical trauma. The rigidity and structure of the cranial bones, along with cushioning from cerebrospinal fluid, shield the brain from mechanical injury and sudden impacts.
In comparison, other cavities like the thoracic cavity (protected by the ribcage) and the abdominopelvic cavity (with less bony protection) are more vulnerable to injury. The combination of the skull’s thick bone and the meninges (protective membranes) makes the cranial cavity uniquely equipped to safeguard the delicate and essential neural tissue it contains.