Across
- 2. allows for quick focusing by moving the objective lens or stage up and down. It is used for initial focusing
- 3. neurons are motor neurons that carry neural impulses away from the central nervous system and towards muscles to cause movement
- 5. where the specimen is placed for observation
- 9. a level of organization in multicellular organisms that consists of a group of similar cells
- 10. release the neurotransmitters of the presynaptic cell into a gap called the synaptic cleft to be taken up by the dendrites of the next neuron
- 18. a thousandth of a metre 1/1000
- 19. usually the lens that is closest to the eye when someone looks through the device
- 20. a group of organs that work together to perform one or more functions
- 22. has different sized holes and is used to vary the intensity and size of the cone of light that is projected upward into the slide
- 24. an automatic response controlled solely by neural circuits in the spinal cord, often relating to posture or locomotion
- 25. the cell body is the neuron's core. It carries genetic information, maintains the neuron's structure, and provides energy to drive activities
- 26. are membrane-bound cell organelles that generate most of the chemical energy needed to power the cell's biochemical reactions
- 28. have many, smaller vacuoles and simply have a cell membrane, but no cell wall
- 29. a typically unicellular organism that lacks a nuclear membrane-enclosed nucleus
- 30. used to bring the specimen into sharp focus under low power
- 32. provides stability and support for the microscope when it is upright
- 35. the transportation system of the eukaryotic cell, and has many other important functions such as protein folding
- 37. the gaps in the insulating sheath (myelin) on the axon of certain neurons that serves to facilitate the rapid conduction of nerve impulses
Down
- 1. the highest level of organisation defined as a living thing that has an organized structure, can react to stimuli, reproduce, grow, adapt, and maintain homeostasis
- 4. is a subcellular structure that has one or more specific jobs to perform in the cell, much like an organ does in the body
- 6. also called nerve fibre, portion of a neuron that carries nerve impulses away from the cell body. A neuron typically has one that connects it with other neurons or with muscle or gland cells
- 7. is a membrane-bound organelle that contains the cell's chromosomes
- 8. magnifies 40x, with total magnification 400x if the eyepiece lens is 10x power
- 11. a collection of tissues that specialized to perform a particular function
- 12. is a cellular particle made of RNA and protein that serves as the site for protein synthesis in the cell
- 13. a millionth of a metre 1/1000,000
- 14. contains a large, singular vacuole that is used for storage and maintaining the shape of the cell
- 15. are building blocks that make up all living things
- 16. processes and packages proteins and lipid molecules, especially proteins destined to be exported from the cell
- 17. a membrane-bound cell organelle that contains digestive enzymes
- 21. extend out-ward from the cell body and are specialized to receive chemical signals from the axon termini of other neurons
- 23. separates the interior of all cells from the outside environment (the extracellular space) which protects the cell from its environment
- 26. to be made up of many cells
- 27. neurons are sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain
- 31. an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances
- 33. to be made up of only one cell
- 34. a billionth of a metre 1/1000,000,000
- 36. designed to transmit light through a translucent object for viewing
- 38. organisms whose cells have a nucleus enclosed within a nuclear envelope