Physiology Flashcards
1
Q
What are the causes of postural hypotension?
A
- Physiological (height)
- Hypovolemia
- Medications
- Autonomic nervous system diseases
2
Q
What is the pathophysiologic cause of Benign paroxysmal peripheral vertigo (BPPV)?
A
Otolith floating free in a semicircular canal
3
Q
The Utricle and Saccule are responsible for sensing which type of acceleration?
A
Linear
4
Q
What is the Vestibulo-ocular reflex?
A
- Maintains visual fixation on a stationary target despite movement of the head
- Vestibular input to III-IV-VI
- Fast
5
Q
The Utricle and Saccule use which structure to sense movement?
A
Otolith organs
6
Q
What CN have parasympathetic fibbers?
A
- III: Ciliary (pupil)
- VII: Pterygopalatine (lacrimal) and Submandibular (salivary)
- IX: Otic (Parotid)
- X: Vagus (Viscera including lungs and heart)
7
Q
The three Semicircular Canals are responsible for sensing which type of acceleration?
A
Angular acceleration of the head (for example, when you turn your head quickly to one side)
8
Q
What is the Opto-kinetic reflex?
A
- Maintains visual fixation on a moving target
- (Visual) Cortical input to III-IV-VI
- Slower
9
Q
The three Semicircular Canals use which structure to sense movement?
A
Cupulae
