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Summary FLG 211 Unit 5 Notes $3.38   Add to cart

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Summary FLG 211 Unit 5 Notes

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Unit 5 notes on FLG 211. The notes are made using the lecture slides, textbook and extra information given by lecturers during class. I got a distinction using these notes. Thank you for your support. I hope you enjoy Physiology as much as I do. Good luck!

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FLG 211 Copyright Micaela de Jager




Unit 5 – Efferent division: Autonomic and Somatic


UNIT 5.1 & 5.2 – THE A UTONOMIC & SOMATIC MOTOR CONTROL

HOMEOSTATIC BALANCE

 Dynamic balance between autonomic branches




The 2 divisions counterbalance
each other’s activity




DIVISIONS OF THE ANS

Sympathetic Parasympathetic
• Mobilizes the body during extreme situations • Performs maintenance activities and conserves body energy
• Exerts long-lasting, diffuse effects • Exerts short-lived, highly localized control
• During flight-or-fight mode • During rest-and-digest mode


Stimulatory Actions of Sympathetic Branch Actions of Parasympathetic Branch
Involves the E activities:
- Exercise Involves the D activities:
- Excitement - Digestion
- Emergency - Defecation
- Embarrassment - Diuresis


Dilation:
Constricts:
• Pupil
• Pupil
• Bronchioles
• Bronchioles
• Blood vessels

Stimulates:
❖ Salivation ≫ Digestion
❖ Heart beat & volume ≫ Insulin release
≫ Urination
❖ Catecholamine release
≫ Erections
❖ Fat breakdown
❖ Ejaculation ❖ Slows heart




MICAELA DE JAGER 69

, FLG 211 Copyright Micaela de Jager




BLOOD PRESSURE

SHORT-TERM REGULATION OF RISING BLOOD PRESSURE

1. ↑ Blood pressure
2. Results in the stretching of baroreceptors → increased impulses to the brain
3. ↑Parasympathetic activity
4. ↓ Sympathetic activity
5. Slowing of heart rate
6. Increased arterial diameter = Reduction of blood pressure




SHORT-TERM REGULATION OF FALLING BLOOD PRESSURE

1. ↓Blood pressure
2. Baroreceptors inhibited → decreased impulses to the brain
3. ↓Parasympathetic activity
4. ↑Sympathetic activity
5. Heart → increased heart rate and increased contractility
Vessels → increased vasoconstriction
Adrenal glands → release epinephrine & norepinephrine
(enhance heart rate, contractility, and vasoconstriction)

6. Decreased arterial diameter = Increase in blood pressure




AUTONOMIC CONTROL CENTRES
• Hypothalamus
➢ Water balance
➢ Temperature
➢ Hunger

• Pons
➢ Respiration
➢ Cardiac
➢ Vasoconstriction

• Medulla
➢ Respiration



MICAELA DE JAGER 70

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