Human Regulation Coordination and Control Regulation in Humans
- Slides: 51
Human Regulation Coordination and Control
Regulation in Humans • Controlled by 2 systems – Nervous System - electrical – Endocrine System – chemical • Both systems respond to and send messages throughout the body
Human Nervous System Central and Peripheral
A General Sense…
An Overview of the Nervous System: Peripheral Nervous System Central Nervous System -Brain -Spinal Cord Sensory Neurons -carry messages towards spinal cord from sensory receptors Somatic System: Voluntary Nerves --neurons control skeletal muscles Sympathetic Division --“fight or flight” --activated by stress Motor Neurons -carry signals away from CNS Autonomic System: Visceral, Involuntary --heart, blood vessels, digestive organs, smooth muscle Parasympathetic Division: --Routine
Nervous System Cells • Called neurons • Neurons have long axons that enable them to transmit signals. Many neurons together are called a nerve. • Each nerve has a dorsal root (info coming into the CNS) and a ventral root (info going out from CNS to body).
Anatomy of a Neuron • Cell body – main part • Dendrite – receives stimulus from other neurons • Axon – branches from cell body, sends the signal out • Myelin sheath – lipid layer for protection over neurons that allows for increase in speed of signal transmission • Synapse – gap between neurons; between the axon terminal of 1 neuron and the dendrite of a 2 nd neuron
Anatomy of a Neuron
Central Nervous System (CNS) BRAIN • About 1. 4 kg, 2% of body weight • About 100 billion neurons • 12 pairs of cranial nerves are connected to the human brain – Example: Pupil reflex in response to bright light, to avoid damage to retina. Nerves that control this reflex are connected to the brain.
• Starts at the medulla oblongata (in the brain) • 31 pairs of spinal nerves branch out to the body • Spinal Reflexes: these don’t go to the brain, instead they go to the spinal cord— – Ex. patellar reflex Spinal Cord
Reflexes • An automatic reaction to some sense message, like pain – Don’t need to think or make decisions about something • The information gets processed in your spinal cord – Your muscles begin to react immediately even before your brain gets the news of what’s happening. – This is called a reflex arc
Reflex Arc • Begins at a receptor – Sensory neurons in the skin receive a stimulus • Travels to the reflex center (spinal cord) • Ends at an effector – A muscle or gland that reacts to the stimulus
Reflex Arc A pathway of nerve impulses 1. Stimulus – a change in the environment that causes a change in the body 2. Receptor – specialized organ that receives the stimulus 3. Sensory neuron – brings the stimulus to the spinal cord 4. Synapse – space between neurons 5. Interneuron – neurons in the spinal cord 6. Motor neuron – brings the stimulus from the spinal cord to the correct part of the body 7. Effector – muscle or gland that reacts to the stimulus
The Patellar Reflex
Peripheral Nervous System (Motor and Sensory) Motor Division: signals away from CNS • Somatic nervous system is for voluntary muscle control. These neurons control the skeletal muscles…. • Autonomic nervous system is automatic or involuntary – Control of heart rate, respiration, blood pressure, smooth muscle, etc. – This has 2 separate divisions: sympathetic and parasympathetic
Autonomic: Sympathetic Division & Parasympathetic Division • Sympathetic: Shunting of blood from one part of body (ex = stomach to heart) to another. Activated by physical or emotional stress. “Fight or Flight” response. • Parasympathetic: Routine life, conserves energy, heart rate lowers, digestive organs back to normal. “Rest and Ruminate” response.
Autonomic NS: Parasympathetic and Sympathetic Controls
Peripheral Nervous System Sensory Division • Sensory neurons carry messages toward the CNS from sensory receptors all over body. • Sensory receptors are in sense organs, such as eyes, ears, mouth, nose, skin… and different regions of the brain respond to different signals.
Transmission of neural signals: How it Works… • In general, the signaling activity of the nervous system is composed of electrical activity within neurons and chemical flow between neurons. Quite a complex network! • 200 years ago… found out that a recently dead animal will still contract muscles if an electrical stimulation is sent through.
Human brain 2005 -2006
Brainstem • The “lower brain” – medulla oblongata – midbrain • Functions – homeostasis – coordination of movement – conduction of impulses to higher brain centers 2005 -2006
Medulla oblongata • Controls autonomic homeostatic functions – breathing – heart & blood vessel activity – swallowing – vomiting – digestion • Relays information to & from higher brain centers 2005 -2006
Midbrain • Involved in the integration of sensory information – regulation of visual reflexes – regulation of auditory reflexes 2005 -2006
Cerebrum • Most highly evolved structure of mammalian brain • Cerebrum divided – hemispheres – left = right side of body – right = left side of body • Corpus callosum – major connection between 2 hemispheres 2005 -2006
Cerebrum specialization • Regions of the cerebrum are specialized for different functions • Lobes – frontal – temporal – occipital – parietal 2005 -2006
The Endocrine System
Endocrine System • A set of glands that produce hormones-- chemical messengers that circulate in the blood
Hormone • Chemical messengers produced by the endocrine glands and circulated in the blood • Similar to neurotransmitters in that they are also messengers • Slower communication system, but with longer lasting effects
Endocrine System
Hypothalamus • Brain region that controls the pituitary gland • Controls homeostasis – the bodies ability to remain at a status quo level
Pituitary Gland • The endocrine system’s gland that controls the other endocrine glands • Called the “master gland” • Located at the base of the brain and connects to the hypothalamus • Controls thirst by controlling the amount of water in the body’s cells • Controls female contractions, and tells the mammary glands to produce milk for newborns • May control grooming habits, companionship, and sexual behavior • Controls the flow of the human growth hormones – dwarfism and gigantism
Thyroid Gland • Endocrine gland that helps regulate the energy level in the body • Located in the neck • controls body temperature • Controls metabolism – our body’s ability to transform the food we eat into usable energy • Overactive- Behaviors may include excitability, insomnia, ADD, agitation, difficulty focusing • Reduced Activity- Behaviors may include sleepiness, reduced muscle tone, overweight
Adrenal Gland • Endocrine glands that help to arouse the body in times of stress • Located just above the kidneys • Release epinephrine (adrenaline) and norepinephrine (noradrenaline) • Increase heart rate, blood pressure, and blood sugar
Pancreatic Gland • Regulates the level of blood sugar (insulin) in the blood • Insulin is needed in the body to break down sugars in the body • Too much insulin in the body devours all of the sugar in the blood. Behaviors exhibited include sluggishness and inattentiveness.
• Too little insulin causes a buildup of sugar in the blood and makes the kidneys use a lot more water to flush it out of the body. The extra water needed to flush the sugar comes from surrounding cells, which in turn dehydrates them and leaves them vulnerable to infection and poisons.
Sex Glands • Ovaries (females) and testes (males) are the glands that influence emotion and physical development. • Testosterone – primary male hormone • Estrogen – primary female hormone • Males and females have both estrogen and testosterone in their systems.
Gonads • Testicles – release androgens (male hormones) • Ovaries – release estrogens (female hormones) • The presence of these chemicals influence male and female reproductive characteristics.
Maintaining Homeostasis • Homeostasis is the maintenance of a stable internal state within an organism. • Organisms detect changes in their environment and respond to these changes in a variety of ways. • A feedback mechanism occurs when the level of one substance influences the level of another substance or activity of another organ.
Feedback Mechanisms Three parts of the mechanism – Sensor – something that can detect a change • Ex. Structures in the brain detect change in CO 2 levels – Control Unit – something that knows what the correct level should be • Ex. Information in the brain is preset for the correct CO 2 level – Effector – something to take the instructions and make changes • Ex. Muscles in the chest used for breathing
Feedback Mechanisms • Positive feedback - designed to accelerate or enhance the output created by a stimulus that has already been activated. • Designed to push levels out of normal ranges. • Example is the release of oxytocin to intensify the contractions that take place during childbirth. – The more oxytocin, the greater and more frequent the contractions, which in turn produces more oxytocin
Feedback Mechanisms • Negative feedback – process in which a stimulus produces a response that opposes the original stimulus. • Ex. Blood sugar regulation – An increase in blood sugar level triggers the release of the hormone insulin by the pancreas – the hormone insulin lowers blood sugar level restoring the body to its original blood glucose level in two major ways: • it increases the ability of body cells to take in glucose from the blood • it converts blood glucose to the compound glycogen -- this compound is also called animal starch and is stored in our liver and muscles – A decrease in blood sugar levels triggers the release of the hormone glucagon by the pancreas • It causes the liver to release glucose into the blood to regulate blood sugar levels
Regulation Disorders • Nervous System – Cerebral Palsy – affect the ability to control body movements – Alzheimer’s – progressive degenerative disease; lose memory and ability to think, speak, etc. – Multiple Sclerosis – cells in the brain and spinal cord do not function normally. • Wide variety of symptoms
Regulation Disorders • Endocrine System – Diabetes – interruption of the feedback system that controls blood sugar. – Type I – born with it • Controlled by insulin injections – Type II – acquired • Usually occurs in older people • May be controlled with diet
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