Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Boards: Cardiovascular > Reflexes > Flashcards

Reflexes Flashcards

1
Q

Bainbridge Reflex

A

Increase in HR following IVF bolus

induced by centralization of blood volume with VC or change in body position
 Reflex also appears to mediate HR s assoc with respiratory sinus arrhythmia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Reverse Bainbridge Reflex

A

may cause bradycardia in face of hypotension during spinal, epidural anesthesia DT increase in venous capacitance, decreased CVP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Bainbridge Reflex: stimulus

A

distention of vena cavae/ RA DT increase in central blood volume.

Detected by atrial stretch receptors (mainly atrial B MR) at junction of vena cavae in RA, in pulmonary veins.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Bainbridge Reflex: Afferent Pathway

A

vagal afferents to medullary vagal nuclei; sensory nucleus of vagus: nucleus tractus solitaries.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Bainbridge Reflex: Efferent Pathway

A

inhibition of vagal PNS outflow to SA node (decrease in ADH release).
 Nucleus ambiguous contains cell bodies for vagal motor neurons to cardiac ganglia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Benzold-Jarish Reflex

A

bradycardia, apnea, hypotension during severe hypovolemia when ventricle empty

AKA coronary chemo reflex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

BJR: stimulus

A

Stimulation of ventricular chemoreceptors and mechanoreceptors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

BJR: Afferent

A

Stimulation sent through C-fibers to the vagus nerve to the vasomotor portions of the brainstem (NTS)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

BJR: Efferent

A

decreased sympathetic outflow (afferent fibers of BJR have a tonic inhibitory effector on vasomotor tone; stimulation leads to decreased vasomotor tone)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

BRR

A

Increased BP, decreases HR

blood pressure sensed at carotid sinus, aortic sinus MR from distension

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

BRR: Afferent

A

Aortic sinus mechanoreceptors signal through Vagus nerve (CNX), carotid body sinus MR signal through glossopharyngeal nerve (CN IX) to nucleus of solitary tract (NTS) then to ventral medulla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

BRR: Efferent

A

Medulla signals increases in PSNS activity (release more ACh), decreases SNS activity at SA node to increases HR

Opposite effect with hypotension/increased SNS tone to increase HR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Branham Reflex

A

Hypertension followed by decrease in HR

Compression or excision of an AV fistula (ex: PDA ligation) resulting in a transient hypertension –> decreased HR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Branham: Afferent

A

Vagus n. to NTS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

OCR: afferent

A

short, long ciliary nerves merge with ophthalmic division of trigeminal nerve, ciliary ganglion –> Gassenan ganglion –> nucleus of trigeminal, vagus nerve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

OCR: efferent

A

Vagal fibers increase tone to SA node

17
Q

Dive Reflex

A

Apnea, decreased heart rate, severe vasoconstriction

Stimulated by submergence of snout of aquatic animal

18
Q

Dive Reflex: Afferent

A

Fibers innervating paranasal areas (anterior nasal mucosa, innervated by infraorbital N, anterior ethmoidal nerve (AEN) from maxillary/ophthalmic divisions of trigeminal)

Send fibers to trigeminal sensory complex.

Projections sent to medullary dorsal horn (MDH) of spinal trigeminal nucleus relay autonomic pathways.

19
Q

Dive Reflex: Efferent Pathway

A

Parasympathetic vagus nerve stimulated to SA node.
 Neurons in rostral ventrolateral medulla (RVLM) increase sympathetic nerve discharge on peripheral vasculature.
 Inhibition of respiration from somatostatin neurons in pre-botzinger complex, ventral respiratory column, retrotrapezoid nucleus silenced

20
Q

Anrep Effect

A

Increase in aortic pressure = positive inotropic effect

21
Q

Bayliss Effect

A

Stretch of vascular SmM –> muscle cox, increased resistance

Result: blood flow toward normal

22
Q

Atrial Stretch R Reflex

A

Atrial distension = release of ANP

ANP = diuretic activity, VD, aldosterone secretion, endogenous antagonist of AGTII

+/- sinus tachycardia, SVT

23
Q

Vasovagal reflex

A

decrease in venous return to heart - sinus bradycardia, hypotension

DT hypovolemia, orthostatic, compression of CdVC, regional ax

24
Q

Craniocardiac Reflex

A

Stimulation of cranial nerves (I, II, V) = bradycardia, hypotension

25
Q

Branham: Efferent

A

Inhibition of sympathetic outflow to SA node

25
Q

Oculocardiac Reflex

A

Compression of eye –> bradycardia

26
Q

Hering-Breuer

A

Lung inflation arrests inspiration
Lung deflation initiates inspiration

Vagus N mediated

27
Q

Pulmonary chemo reflex

A

Stim of C fiber endings (juxtapulmonary capillary R/J R) by tissue damage, fluid accumulation and accumulation of cytokines = sinus bradycardia, hypotension, shallow breathing, apnea, BC, mucous secretion

28
Q

Venorespiratory reflex

A

increased RAP = increased in RR

29
Q

Vagovagal Reflex

A

Afferent, efferent pathways in vagus nerve eg stimulation or irritation of larynx or trachea by laryngoscope, etc

Boards: Cardiovascular (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions