NS & ES Flashcards

1
Q

Function of cerebral cortex (grey matter)

A

Conscious thought & awareness of stimuli

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2
Q

Describe pathway of sensory info.

A

Receptor -> Sensory neuron -> ascending/sensory tracks in SC -> brain stem -> Thalamus -> cerebral cortex

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3
Q

Describe pathway for sensory info.

A

Receptor -> Sensory neuron -> ascending/sensory tracks in SC -> brain stem -> Thalamus -> Cerebral cortex (integration & awareness of stimuli)

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4
Q

Describe pathway for motor info.

A

Cerebral cortex -> impulses for consious decision travel through cerebrum -> brainstem -> motor/descending tracts in SC -> synapse to motor/effterent neuron -> efffector organ

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5
Q

Define reflex

A

Rapid (min. synapse), Involuntary, Predictable (same), Unlearnt (reflex arc) response to a stimulus. Bypass conscious part of brain => rapid resp.

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6
Q

Path of reflex arc

A
  1. Sensory receptor
  2. Sensory neuron travel through nerve & dorsal root ganglion
  3. Interneuron = Integration area
  4. Motor neuron travels through ventral root
  5. effector organ
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7
Q

Somatic reflex & e.g.

A
  • Effector: skeletal muscles
  • Function: Prevent further damage from stimuli; balance/posture
  • Integration: SC or brain
  • E.g: Patellar reflex
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8
Q

Autonomic reflex & e.g

A
  • Effector: Smooth muscle, cardiac muscle, body viscera (salivary glands, gut wall)
  • Function: maintain bodily functions (move food through digestive sys, HR, BP, CO2 levels)
  • Integration: SC or brainstem through Autonomic NS
  • E.g: Defecation & micturition reflex
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9
Q

Briefly describe diff. b/w sub & conscious control

A

Sub: No decision making (less synapse); not complicated (quick resp.)
Conscious: Decision making (more); complicated resp (slow)

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10
Q

Diff. b/w NS & endocrine

A

NS: rapid resp. (AP & neurotrans.), Sub/conscious control
ES: Slow resp. (hormones in blood), feedback loops

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11
Q

Function of medulla oblongata

A

Integrate reflexes (many nuclei/grey matter)

  • Respiratory (Medullary rhythmicity center)
  • blood vessel (vasomotor center)
  • HR (cardiac center)
  • swallowing, coughing, vomiting, hiccuping
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12
Q

Function of pons

A

(Nuclei)

  • Sleep centre initiates REM (deep) sleep
  • respiratory (Pontine respiratory centre)
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13
Q

Function of midbrain

A

(nuclei stabilise somatic movement)

  • VIsual reflexes (head & eye movements tracking objects)
  • Auditory reflexes (startle reflex)
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14
Q

what connects pituitary gland to hypothalamus

A

Anatomically: infundibulum (pituitary stalk)
Functionally: blood vessels & nervous tracts

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15
Q

Functions of hypothalamus

A
  • Homeostatic mechanism: Tb, sleep-wake cycles, food intake, water balance & thirst
  • autonomic control: pituitary gland secretions, regulate cardiac & smooth muscle & glands
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16
Q

2 pituitary glands & origin

A

Ant. (adenohypophysis) 70-80%: made of glandular cells from roof of mouth
Post. (neurohypophysis): made of neural tissue. Grew down from brain

17
Q

Name of network of capillaries in Ant. Pt gland, & the tract in the Post Pt gland

A

Ant: hypothalamohypophysial PORTAL system
Post: hypothalamohypophysial TRACT (allow neural secretion= release hormones)

18
Q

Tropic hormones & e.g

A

Secreted from one gland to stimulate another endocrine gland. E.g. FSH, LH, TSH, ACTH

19
Q

Types of communication: Differentiate autocrine, paracrine & endocrine cells

A

Auto: affects same cells that secrete chemicals
Para: affects local cells
Endo: affects (target) cells distant from source

20
Q

Diff. Endocrine & exocrine glands

A

Endo: ductless. Hormones diffuse into interstitial fluid into capillaries
Exo: ducts seccrete products (not hormones)

21
Q

2 types of hormones & e.g.

A
  1. AA based = water soluble. E.g. all from Pt gland
  2. steroid based = lipid soluble. E.g. hormones w/ -one
    * Thyroxine (T3 & T4) is AA but is LIPID soluble
22
Q

Describe transport w/water & lipid soluble

A

Water: dissolve in plasma & travel freely. Degrade rapidly
Lipid: combine w/ binding protein when in blood but released when going out

23
Q

Method of action for direct method

A
  1. lipid soluble H diffuse in cell through membrane
  2. attach to receptor inside cell (cytop. / nucleus)
  3. Hormone-receptor complex travel to nucleus (nuclear envelop)
  4. Activates specific genes (=> protein synthesis)
24
Q

3 ways hormones alter cell activity

A
  1. Change activity of organelles
  2. Change cell membrane permeability
  3. Activate a cell mechanism
25
Q

Method of action for indirect method

A
  1. water soluble H attach to receptor on membrane’s surface activate G protein complex (alter activity of adenyl-cyclase)
  2. Enzyme converts ATP -> cAMP (2nd messenger).
  3. Protein-kinases (regulatory enzyme) activated
  4. Cell processes altered (e.g. activate enzymes)
26
Q

HUMORAL stimuli for hormone release

A

Changing blood levels (substances in blood) as the stimulus. E.g. parathyroid gland secreted if low Ca2+

27
Q

NEURAL stimuli for hormone release

A

Neurotrans. (released from nerves) stimulate target cell (to release hormones). E.g. adrenal medulla stimulated by parasym. NS

28
Q

HORMONAL stimuli for hormone release

A

(tropic) hormones stimulate target cells to secrete hormones

29
Q

Diff. b/w -ve & +ve FB

A

-ve: reduce stimulus

+ve reinforces stimulus

30
Q

6 Major endocrine glands

A

hypothalamus, Pt gland, Thyroid & parathyroid gland, adrenal gland & pancreas

31
Q

Pancreatic islets produce # hormones which are and each produced by _ cells…

A

3.
> Glucagon (alpha)
> insulin (beta)
> Somatastatin (delta)