Hypothalamus (brain region controlling the pituitary gland) # 18 (affects metabolism, among other things), Peripheral #15 seir-regulated action of internal organs and glands) Word bank: A. Peripheral B. Calming # 20 (secretes male sex hormones) Sympathetic # 13 Nervous system C. Somatic # 19 #14 # 12 (controls voluntary movements of skeletal muscles) (brain and spinal cord) Parasympathetic #16 D. Central E. Autonomic A. Arousing (secretes many different hormones, some of which affect other glands) # 21 (inner part, called the medulla, helps trigger the "fight or flight" response) #22 (regulates the level of sugar in the blood) #17 (secretes female sex hormones) Word bank: A. Pancreas B. Adrenal Gland C. Thyroid Gland D. Ovaries E. Testis A. Pituitary Gland # 23- What system is shown in the last chart? # 24 - What does this system use to communicate? # 25 - What is it called when a neural impulse is actually firing? A Actions Potential B. Hormones C. Endocrine System
1) The nervous system comprises, millions of nerve cells. The basic unit of the nervous system is called neurons or nerve cells,
The human nervous system can be classified into 2 parts :
1) The Central Nervous System (CNS)
2) The Peripheral Nervous System (PNS)
The Central Nervous System comprises the brain and spinal cord.
The Peripheral Nervous System on the other hand, comprising of cranial nerves extending from the brain and spinal nerves, ganglia extending from the spinal cord. The PNS comprises mainly nerves, ganglia which connects the CNS with sense organs and with internal organs, muscles and glands throughout all parts of the body.
The Peripheral Nervous System has 2 subdivisions. 1) Somatic Nervous System and 2) Autonomic Nervous System.
The somatic nervous system, joins the CNS to voluntary muscles throughout the body of humans. The autonomic nervous system, joins the CNS to internal organs, glands and muscles that are involuntary.
Autonomic Nervous System is again divided into two separate parts, these are 1) Sympathetic Nervous System and 2) Parasympathetic Nervous System.
The sympathetic nervous system, makes the body ready for utilizing energy. It prepares the body by making the body's response stronger against unfavorable conditions. Sympathetic nervous system arouses or stimulates the body and stimulation of sympathetic nervous system raises the blood pressure, raises blood sugar, accelerates heart beat, dilates pupil, secretion of sweat glands, etc.
The parasympathetic nervous system on the other hand, functions to restore and conserve the energy that have been utilized. The parasympathetic nervous system calms the body. When the parasympathetic nervous system gets activated, it lowers heartbeat, blood pressure and redirects blood away from skeletal muscles, etc.
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