In brain injury a severe trauma in which the brain is not just jarred but the impact also causes bruising to the brain is known as:

Correct Answer: B

Rationale: A contusion is a type of brain injury characterized by bruising and damage to brain tissue, often resulting from a direct impact to the head. Unlike a concussion, which involves temporary dysfunction without visible damage, a contusion causes physical injury to the brain, leading to swelling, bleeding, and potential long-term neurological deficits. Contusions require careful monitoring and treatment to prevent complications such as increased intracranial pressure.

Correct Answer: D

Rationale: Acetylcholine and norepinephrine are two well-known neurotransmitters that play critical roles in the nervous system. Acetylcholine is involved in muscle contraction, memory, and learning, while norepinephrine regulates attention, arousal, and stress responses. These neurotransmitters bind to specific receptors on postsynaptic neurons, triggering electrical signals that propagate neural communication. Their proper functioning is essential for normal brain and body activities.

Correct Answer: A

Rationale: The nervous system is composed of several key organs, including the brain, spinal cord, nerves, and ganglia. Ganglia are clusters of nerve cell bodies located outside the central nervous system and play a role in processing and transmitting nerve signals. Axons and neurons are components of nerves, while the dura mater is a protective membrane surrounding the brain and spinal cord. Ganglia are the correct answer as they are distinct organs within the nervous system.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.