11/3 & 11/4 - 7th Grade Agenda Learning Objective: Learn about Neurons Collect Reading & Notetaking p.284 & 285 Chap 3 Test Text book Reading p.602-613 HW: Reading & Notetaking p.286 & 288 Reminder: HW: Cell Model due 11/5 & 11/6 (40 Points)
Reflection Prompt: What are the 3 type of Neurons? Define what they do.
What is the Nervous System? The nervous system receives infor________ about what is happening both inside and outside your body. Like the Internet, your nervous system is a commun________ network. mation ication
Responding to Information Any change or signal in the environment that can make an organism react is called a stim_______ A resp_____ is what your body does in reaction to a stimulus ulus onse
What is Homeostasis? Homeostasis is the process by which an organism’s internal environment is kept stable in spite of changes in the external environment.
How does your body maintain a constant temperature on a hot day? By perspiring The liquid evaporates and it absorbs heat in the body and carries it away.
Structure of Neurons The structure of neuron enables it to carry nerve imp_________. A neuron has large cell body that contains the nucleus, threadlike extensions called den_______, and an axon ulses drites
Structure of Neurons drites Den_________ carry impulses towards the neuron’s cell body The ax____ carries impulses aways from the cell body An axon or a nerve cell can be 3 feet long. on
3 Types of Neurons sory Sen_______ neuron picks up stimuli from the internal or external environment An inter________ is a neuron that carries nerve impulses from one neuron to another A motor neuron sends an impulse to a muscle or gland neuron
What is a synapse? The gap between axon and dendrite is called a syn_______ The axon tips release che______ that carry the impulse across the gap (synapse) apse micals
What is the central nervous system? The cen______ nervous system is the control center of the body. It includes the brain and the spi____ cord. nal
Interesting Facts about the Nervous System There are 100 billion neurons in your brain alone. A newborn baby's brain grows almost 3 times the first year. The left side of human brain controls the right side of the body The right side of the brain controls the left side of the body.
Interesting Facts about the Nervous System An average adult male brain weighs about 1375 grams. An average adult female brain is about 1275 grams. Only four percent of the brain's cells work while the remaining cells are kept in reserve. Neurons do not multiply Neurons are the largest cells in the human body. (They can be up to 3 feet long) The Nervous System can transmit impulses as fast as 100 meters per second.
The Brain The three main regions of the brain are the cerebr____, the cerebell___ and the brain stem. um um
The Cerebrum Cerebrum is the largest part of the brain. The cerebrum interprets input from the senses, controls move_____, and carries out learning and remem______ ment bering