Introductory Information No principle is more central to today’s psychology than this:...

Introductory InformationNo principle is more central to today’s psychology than this:

“Everything Psychological is also biological.”

Your every idea, every urge, every mood, is a biological happening. You love, laugh, and cry with your body. Without your body, your genes, your brain, your appearance…you are nobody.Although we find it convenient to talk separately of biological and psychological influences on behavior, we need to remember: to think, feel, or act without a body would be like running without legs.

Early Approaches to Understanding the Brain

Plato correctly located the mind in the spherical head-his idea of the perfect form. His student Aristotle believed the mid was in the heart, which pumps warmth and vitality to the body. The heart remains our symbol for love, but science has long since overtaken philosophy on this issue. It’s your brain, not your heart that falls in love.

Anybody Know What Phrenology Is?

Neural Communication

BASIC TERMSNeuron: A nerve cell. The basic building blocks of

the nervous system.Motor Neuron: Neurons that carry outgoing

information from the brain and spinal cord to the muscles and glands.

Interneurons: Neurons within the brain and spinal cord that communicate internally and intervene between the sensory inputs and motor outputs.

Dendrite: the bushy, branching extensions of a neuron that receive messages and conduct impulses toward the cell body.

Axon: the extension of a neuron, ending in branching terminal fibers, through which messages pass to other neurons or to muscles and glands.

All my science people…What does this statement mean…

AXONS SPEAK…DENDRITES LISTEN.

Also…To remember that dendrites bring information in and axons convey information out, just remember…

AXONS AWAY

MORE BASIC TERMS:Myelin Sheath: a layer of fatty tissue

segmentally encasing the fibers of many neurons; enables vastly greater transmission speed of neural impulses as the impulse hops from one node to the next.

Action Potential: a neural impulse; a brief electrical charge that travels down an axon.

ACTION POTENTIAL

Understanding Action PotentialThreshold: The level of stimulation required to trigger a neural impulse

Synapse: The junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron. When released by the sending neuron, neurotransmitters travel across the synapse and bind to receptor sites on the receiving neuron, thereby influencing whether that neuron will generate a neural impulse.

How Neurons Communicate

The Nervous System

Dual Functions of the Autonomic Nervous System

Nervous System Vocabulary WordsNervous System: The body’s speedy

electrochemical communication network, consisting of all the nerve cells of the CNS and PNS.

CNS: Brain and spinal cordNerves: bundled axons that form neural

“cables” connecting the CNS with muscles, glands, and sense organs.

Somatic Nervous System: Division of the PNS that controls the body’s skeletal muscles.

More VocabAutonomic Nervous System: the part of the

PNS that controls the glands and the muscles of the internal organs (such as the heart). It’s sympathetic division arouses; it’s parasympathetic system calms.

Sympathetic Nervous System: the division of the autonomic nervous system that arouses the body, mobilizing it’s energy in stressful situations.

ReflexesReflexes are our responses to sensory stimuli. Such as the knee-jerk response. Relates to our Central Nervous System.

More On Reflexes

Endocrine System

Endocrine System VocabularyEndocrine System: The body’s “slow” chemical

communication system; a set of glands that secrete hormones into the bloodstream.

Hormones: chemical messengers that are manufactured by the endocrine glands, travel through the bloodstream and affect other tissues.

Adrenal Glands:A pair of endocrine glands that sit just above the kidneys and secrete hormones (epinephrine and norepinephrine) that help arouse the body in times of stress.

Pituitary Gland: The Endocrine System’s most influential gland. Under the influence of the hypothalamus, the pituitary gland regulates growth and controls other endocrine glands.

Important Endocrine Glands and Their Functions

Anterior Pituitary Gland: Secretes Growth Hormone. Too little produces dwarfism. Too much results in gigantism.

Posterior Pituitary Gland: Secretes Vasopressin constricting blood vessels and raising blood pressure.

Thyroid releases thyroxine and triiodothyronine, increasing metabolic rate, growth, and maturation.

Parathyroids release parathyroid hormone, increasing blood calcium and decreasing potassium

Pancreas secretes insulin, regulating the level of sugar in the bloodstream

Ovaries secrete estrogen

Testes release androgens promoting sperm production