Biology Crossword Assignment

2. the largest and most prominent part of the brain.
4. it divides the cerebrum in two hemispheres.
6. some stimuli arise within the organism's bogy. They are called as __________ stimuli.
8. they are part of neuron cells which receive messages from other neurons.
12. any condition in an environment which causes a reaction in an organism.
14. he developed the concept of conditioned reflex through the famous study with dogs.
15. structual and functional unit of the nervous system.
17. the ear nerve is connected to the brain by this nerve.
18. a long fibre covered by a sheath.
19. the three membranes which envelope the brain.

1. special cells in the sense organs that receive stimulus from the environment.
3. an electrical signal carrying messages.
5. nerves carrying messages from the sense organs to the brain/spinal cord.
7. there are _______ pairs of cranial nerves.
9. nerve cells or neurons are joined end to end forming ________.
10. the eye is connected to the brain by this nerve.
11. an italian scientist who devised a way of staining nervous tissue with a silver solution and studied the structure of nerve cells in intricate detail.
13. junction where communication between two neurons.
16. a highly developed organ and is situated in the cranium of the skull.
17. it controls all the involuntary actions, including the heart beat, movements of muscles of the stomach,etc.