The brain is protected and brain tissue is provided with nutrients and oxygen by?
Correct answer: B. Meninges
- A. Cranium
- B. Meninges
- C. Skull
- D. Ventricles
Explanation
Option B is correct since meninges provide the brain with nourishment and protection. The pia matter and dura matter (the inner layers of meninges) are highly vascularized, with blood vessels perforating through the membrane to supply the underlying neural tissue. These meninges have two major functions:1)Provide a supportive framework for the cerebral and cranial vasculature. 2)Acting with cerebrospinal fluid to protect the CNS from mechanical damage.Option A is incorrect since the cranium is a bony covering that protects the brain from mechanical damage but does not provide it with nutrients as it is not vascularized.Option C is incorrect since the main difference between the skull and cranium is that the skull is composed of both facial bones and the cranium whereas the cranium is the upper part of the skull, composed of bones that do not move. Since the skull is also a bony structure, it only protects the brain from mechanical damage.Option D is incorrect since ventricles play a role in shock absorption and reduce physical stress.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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