The body cavities that protect the nervous system are located in the
Dorsal
ventral
vertebral
thoracic
cranial Cavity
The Correct Answer is A
A. Dorsal: The dorsal body cavity protects the central nervous system and is subdivided into the cranial cavity, which encloses the brain, and the vertebral cavity, which encloses the spinal cord. Together, these cavities provide rigid protection by surrounding nervous tissue with bone.
B. Ventral: The ventral cavity contains organs such as the lungs, heart, and abdominal viscera. It is not the primary cavity responsible for protecting the nervous system, as it mainly houses thoracic and abdominopelvic organs.
C. Vertebral: The vertebral cavity specifically encloses and protects the spinal cord. While it is part of the system that safeguards the nervous system, it is only one subdivision of the dorsal cavity rather than the overall cavity protecting the nervous system.
D. Thoracic: The thoracic cavity lies within the ventral body cavity and contains the lungs and heart. It is not associated with protection of the brain or spinal cord, so it does not serve the role of safeguarding the nervous system.
E. Cranial cavity: The cranial cavity encases and protects the brain. Like the vertebral cavity, it is part of the dorsal cavity, but it represents only one subdivision rather than the complete system of protection for the nervous system.
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Related Questions
Correct Answer is D
Explanation
A. Each enzyme is chemically specific: Enzymes act only on particular substrates due to the unique shape of their active sites. This chemical specificity ensures that metabolic reactions occur in a controlled and precise manner.
B. Some enzymes make up part of the plasma membrane: Enzymes can be embedded in the plasma membrane, where they catalyze reactions such as breaking down extracellular substances or facilitating signal transduction.
C. Some enzymes are protein plus a cofactor: Many enzymes require non-protein helpers, such as metal ions or vitamins, to function effectively. In such cases, the enzyme is described as a holoenzyme, consisting of the protein part (apoenzyme) plus a cofactor.
D. Enzymes work by raising the activation energy: Enzymes actually lower the activation energy needed for reactions, making biochemical processes proceed more efficiently.
Correct Answer is A
Explanation
A. 2.8.1: This configuration represents sodium, which has one electron in its outermost shell. Atoms with only one valence electron are highly reactive because they tend to lose that electron easily to achieve a stable octet, making this an unstable atom.
B. 2: This configuration corresponds to helium, with two electrons filling its first shell completely. A filled shell makes the atom stable and chemically inert, so it is not reactive.
C. 2.8.8: This configuration corresponds to argon, which has a completely filled outer shell of eight electrons. A full valence shell makes the atom chemically stable and non-reactive under normal conditions.
D. 2.8: This configuration corresponds to neon, which has a full octet in the second shell. With a complete outer shell, neon is very stable and does not readily participate in chemical reactions.
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