The tissue in the image is from which body system?

• A. Central Nervous System
• B. Muscular System
• C. Cardiovascular System
• D. Digestive System

Answer: (A)

The tissue shown is nervous tissue, which is characterized by neurons with a visible cell body and branching processes. In histology, neurons are the key clue: a relatively large cell body with a prominent nucleus and nucleolus, plus dendrites and an axon extending from the soma. This pattern points to the nervous system, and within that, brain and spinal cord anatomy are classic examples of the central nervous system. The central nervous system is made up of these neural elements organized into gray matter (cell bodies) and white matter (myelinated axons), which helps distinguish it from other body systems.

Muscular tissue would show organized muscle fibers, often with striations or branching and intercalated discs in cardiac muscle. Digestive tissue typically displays mucosa with epithelial lining, glands, and smooth muscle layers arranged in a way that supports digestion. Cardiovascular tissue would highlight cardiac muscle with intercalated discs or blood vessel walls, rather than neuron-like cell bodies.

So, the presence of neurons with their characteristic cell bodies and processes identifies the tissue as nervous tissue from the central nervous system.