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Zoology 4   senses & endocrine
 

Zoology 4 senses & endocrine

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    Zoology 4   senses & endocrine Zoology 4 senses & endocrine Presentation Transcript

    • Senses
    • Sensation vs. Perception Sensation – is conscious awareness of a stimulus Perception – is understanding what the sensation means Sensory Adaptation – a decrease in the response to a stimulus
    • Sensory Receptors Six Major Types: 1. Mechanoreceptors – detect forms of mechanical energy (changes in pressure, position, or acceleration)  touch, auditory, balance, baroreceptors
    • Sensory Receptors Six Major Types: 2. Thermoreceptors – detect heat energy (changes in temperature)
    • Sensory Receptors Six Major Types: 3. Nociceptors – pain receptors; detect tissue damage (for example: distortions, burns)
    • Sensory Receptors Six Major Types: 4. Chemoreceptors – detect chemical energy of specific substances  taste, smell
    • Sensory Receptors Six Major Types: 5. Osmoreceptors – detect changes in water volume (solute concentration) 6. Photoreceptors – detect visible light
    • Endocrine System
    • Hormones Interact Three Major Ways: 1. Opposing interaction – effect of one opposes the effect of another Ex. Insulin and Glucagon Insulin – lowers blood sugar levels Glucagon – increases blood sugar levels
    • Hormones Interact Three Major Ways: 2. Synergistic interaction – the combined action of two or more hormones is required to produce an effect Ex. Prolactin, oxytocin and estrogen  produce and secrete milk
    • Hormones Interact Three Major Ways: 3. Permissive interaction – one hormone produces an effect only when a different hormone “primes” the target cell Ex. Pregnancy occurs if lining of uterus is exposed to estrogen, then to progesterone
    • Hormone Categories 1. Steroids - estrogen, testosterone, progesterone, aldosterone, cortisol 2. Non-steroids - amines (norepinephrine, epinephrine) - peptides (ADH, oxytocin) - proteins (insulin, prolactin) - glycoproteins (FSH, LH)