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The Nervous System
Body Structures Chapters 10 + 11 Page 219
Question | Answer |
---|---|
Nerve cells are AKA | neurons. |
The axon is the portion of a neuron that | carries impulses from one neuron to the next. |
The axon is surrounded by a protective lipoprotein called | myelin sheaths. |
The myelin sheaths allow nerve impulses to travel at | 200 miles/second. |
Unmyelinated nerve impulses travel at | 0.5 meter/second. |
A degenerative nerve disease caused by a degradation of the myelin sheaths is called | multiple sclerosis (MS). |
CNS stands for | central nervous system. |
The CNS is made up of the | brain and spinal cord. |
The brain makes ____________ calculations/second to maintain body functions. | 100 trillion |
The brain contains | 100,000,000,000 neurons. |
The PNS stands for | peripheral nervous system. |
The PNS is made up of | all the nerves except the brain and spinal cord. |
The PNS is made up of | 1. Sensory neurons AKA afferent neurons. 2. Motor neurons AKA efferent neurons. |
Sensory (afferent) neurons transmit changes in the environment to the brain for | interpretation. |
Changes in the environment are called | stimuli. |
Motor (efferent) neurons transmit commands from the brain to the | muscles to facilitate movement. |
Smooth voluntary muscle movements are greatly influenced by the chemical neurotransmitter | dopamine. |
A disease caused by a deficiency of dopamine is called | Parkinson’s disease (PD). |
The ANS stands for | autonomic nervous system. |
The ANS is considered | involuntary (reflex). |
These reflexes include: | coughing, choking, sneezing, swallowing, and vomiting. |
The ANS is subdivided into the | 1. Sympathetic division AKA “fight or flight reactions.” 2. The parasympathetic division. |
The sympathetic division uses a neurotransmitter (chemical) called | norepinephrine (NE) to transmit impulses. |
The parasympathetic division uses a neurotransmitter called | acetylcholine (Ach) to transmit impulses. |
The parasympathetic division operates during normal non-stressful situations (“rest and digest”) and includes: | a. Digestive processes. b. Reproductive processes. c. Eupnea. d. Normal heart rate (HR). |
Changes that occur during the sympathetic (“fight or flight”) response are: | a. Tachycardia. b. Tachypnea. c. Bronchodilation. d. Pupillary dilation. e. Pallor due to shunting of blood from the periphery to the large muscles of the arms and legs, brain, heart, and lungs. |
The largest part of the brain is called the | cerebrum. |
The outer portion of the cerebrum is called the | cerebral cortex. |
The cerebrum is divided into right and left halves called | hemispheres. |
These hemispheres are connected and communicate by the | corpus callosum. |
Sections of the brain are called | lobes. |
The frontal lobe controls: | 1. Voluntary muscle function. 2. Moods. 3. Aggression. 4. Smell reception (olfactory). 5. Motivation. |
The parietal lobes evaluate sensory stimuli such as: | 1. Touch. 2. Pain. 3. Balance. 4. Taste. 5. Temperature. |
The temporal lobes evaluate: | 1. Hearing input. 2. Smell. 3. Memory. 4. Judgment. |
The occipital lobe functions in receiving and interpreting | visual input. |
Depression, migraines, anxiety, appetite, sexuality, and bipolar disorder are influenced by the chemical neurotransmitter | serotonin. |
The second largest portion of the brain is called the | cerebellum. |
The cerebellum is located at the | posterior base of the brain. |
The cerebellum functions as a reflex center for | coordination and balance. |
The brain stem consists of the: | 1. Medulla oblongata. 2. Pons Varolii. 3. Midbrain. |
The medulla and pons are responsible for controlling: | 1. Consciousness and arousal. 2. Regulation of diameter of blood vessels (BP). 3. Heart rate (HR). 4. Ventilation (breathing). |
The midbrain acts as the connection between the | cerebrum and the spinal cord. |
The thalamus is the | principal relay station for sensory impulses that reach the cerebral cortex. |
The hypothalamus controls: | 1. The pituitary gland. 2. Feelings of rage and aggression. 3. Body temperature. 4. Thirst. 5. Sleep. 6. Food intake (satiation). |
The spinal cord begins as a continuation of the | medulla oblongata. |
The length of the spinal cord is approximately | 16 -18 inches. |
The function of the spinal cord is to | 1. Convey sensory impulses from the periphery to the brain. 2. Conduct motor impulses from the brain to the periphery. |
Branching off the spinal cord are the | 31 paired spinal nerves. |
Most spinal nerves exit the vertebral column between the | adjacent vertebrae. |
Spinal nerves consist of: | 8 cervical pairs. 12 thoracic pairs. 5 lumbar pairs. 5 sacral pairs. 1 coccygeal pair. |
The brain and spinal cord are surrounded by protective membranes called | meninges. |
The outermost meninx is called the | dura mater (tough mother). |
The middle meninx is called the | arachnoid membrane (spider layer). |
The innermost meninx is called the | pia mater (delicate mother). |
Between the dura mater and arachnoid membrane is the | subdural space. |
The subdural space contains | serous fluid. |
Between the arachnoid membrane and the pia mater is the | subarachnoid space. |
The subarachnoid space contains | CSF (cerebrospinal fluid). |
CSF circulates around the brain and spinal cord through cavities called | ventricles. |
The CSF serves as a | shock absorber and circulates nutrients. |
The brain has 12 cranial nerves | I. Olfactory(S), II. Optic(S), III. Oculomotor(M),IV. Trochlear(M),V. Trigeminal(B) VI. Abducens (M) VII. Facial (B) VIII. Auditory (Vestibulocochlear) (S) IX. Glossopharyngeal (B) X. Vagus (B) XI. Spinal accessory (M), XII. Hypoglossal (M) |