Lec 2 | SEP 10/12 - Chp.2 The Systems of the Body The Nervous System ● ● ● ● ● Central N.S(inside Brain and the spinal cord Peripheral N.S

Lec 2 | SEP 10/12 - Chp.2 The Systems of the Body The...

This preview shows page 1 - 4 out of 8 pages.

Chp.2 The Systems of the Body The Nervous System Central N.S (inside) : Brain and the spinal cord Peripheral N.S: Made of somatic and autonomic NS Somatic (voluntary) Nervous System: Connects nerve fibres to voluntary muscles and provides feedback to the brain in terms of sensory info. About voluntary movement Autonomic Nervous System Regulation occurs via SNS and PNS Sympathetic Nervous System involved in stress responses Fight or flight Mobilizes energy Parasympathetic Nervous System Controls organs PNS restores body to normal after an emergency has passed PNS active during digestion Conserves energy (anabolic) Brain Commands centre of the body 3 Parts Hindbrain, Midbrain, Forebrain The Brain Hindbrain: Medulla: (regulates heart rate, BP, and respiration) Pons (link bw medulla and cerebellum; also involved in respiration) Cerebellum Mindbrain: Pathway for sensory and motor impulses moving bw fore and hindbrain Forebrain: Diencephalon: - thalamus (involved in recognition of sensory stimuli and the relay of sensory impulses to the cerebral cortex - hypothalamus (regulates the centres in the medulla that 1
Image of page 1

Subscribe to view the full document.

control cardiac functioning, blood pressure, and respiration. Also regulates water balance, appetite/hunger, and sexual desire) (4 F’s- feeding, fleeing, ) With the pituitary gland, the hypothalamus helps to regulate the endocrine system, which releases hormones that influence the body’s organs Telecephalon: -2 hemispheres of the cerebral cortex, which is the largest part of the brain and is involved in higher order intelligence, memory, and personality. LImbic System: Plays an important role in stress and emotional responses Amygdala and Hippocampus: detection of threat emotional memories Cingulate gyrus, Septum, areas of the Hypothalamus: involved in emotional functioning, too. The Nervous System Neurotransmitters: Chemicals that regulate NS functioning Stimulation of the SNS involves secretion of Catecholamines: Epinephrine and Norepinephrine (NE) Release into the bloodstream and carried throughout the body Released during stressful times NE and Epinephrine (british) As part of the stress response: Increased heart rate Blood vessels constrict to increase BP Blood diverted into muscle tissue Pupils dilate Sweat glands are stimulated (part of thermoregulation - sweating cools us down) Common during highly stressful events or strong emotions (fear, embarrassment) Disorders of the NS: Epilepsy Disease of the CNS. Sometimes traced to injury at birth, brain injury, infectious disease etc. Often no specific cause Marked by seizures or violent convulsions Not curable, but treated with medications and behavioural 2
Image of page 2
interventions for stress Parkinson’s disease Progressive degeneration of the basal ganglia, a group of nuclei that control motor coordination, resulting in tremors, slow movement, etc.
Image of page 3

Subscribe to view the full document.

Image of page 4
  • Winter '12
  • ElizabethK.Nisbet

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes