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7th Science Part 5
Malia Faith Nelson-A Beka Book- Chapter 3- Your Wonderful Body
Question | Answer |
---|---|
Muscular system | Responsible for producing the movements of your body |
About ___ of your body weight is ______. | Half, muscle |
Skeletal muscles | Muscles that you directly control with a conscious mind |
Tendons | Tough, cordlike things that attach skeletal muscles to the bones of the skeletal system |
Muscles are like ropes they can ____, but they never ____. | pull, push |
Origin | Anchors one side of a skeletal muscle |
Insertion | Attaches the other side of the skeletal muscle. |
The __________ is always pulled ______ the origin. | Insertion, organ |
Involuntary muscles | Do their work whether you think about them or not; they are vital to your body |
Nervous system | Coordinates the activities of your body |
What are the two major divisions of your brain? | Central nervous system and peripheral nervous system |
Central nervous system | The brain and the spinal cord |
Peripheral nervous system | Composed of nerves and nerve tissues called ganglia |
Nerves | Bundles of fibers that connect the central nerbous system with the rest of the body |
Nerves transmit information through your body as electrochemical messages called ________. | Impulses |
________ travel to and from the central nervous system allowing the _____ and ______ ____ to control all your other body systems. | Impulses, brain, spinal cord |
Brain | Chief organ of the nervous system and consists of the cerebrum, the cerebellum, and the brain stem. |
Cerebrum | Largest part of the brain and controls conscious though and reason |
The cerebrum is divided into two halves or ___________. | Hemispheres |
Cerebellum | Responsible for balance and skeletal muscle coordination. Coordinates activities like walking writing speaking and riding a bike. |
Brain stem | Connects the rest of the brain to spinal cord |
Spinal cord | Controls simple reflexes and transmits impulses from the brain to the peripheral nervous system |
Sensory nerve fivers | Transmits information to the brain and the spinal cord |
Motor nerve fibers | transmit messages form the central nervous system to the muscles and other organs |
Sensory receptors | Special nerve endings that detect conditions around you. |