Explain the difference between tonic and antagonistic control of homeostatic balance. Fig. 6.15 Give two examples of each. ANTAGONISTIC CONTROL(b) Antagonistic control uses differentsignals to send a parameter inopposite directions. In thisexample, antagonisticneurons control heart rate:Stimulation by sympathetic nerves increases heart rate.Heartbeatssome speed it up, whileothers slow it down.23Time (sec) –SympatheticneuronParasympatheticneuronStimulation by parasympathetic nerves decreases heart rate.Heartbeats23Time (sec)? FIGURE QUESTIONWhat heart rates (in beats/min)are shown on the two ECGtracings? TONIC CONTROL(a) Tonic control regulates physiological parametersin an up-down fashion. The signal is always presentbut changes in intensity.Decreased signal ratevessel dilatesChange insignal rateTimeElectricalIf the signal rate decreases,the blood vessel dilates.signalsfromTimeneuronderate signal rateresults in a blood vesselof intermediate diameter.Increased signal ratevessel constrictsTimeIf the signal rate increases,the blood vessel constricts.

From the word tonic itself we understood that tonic means it's a positive or feel good thing. Where…

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Explain the difference between tonic and antagonistic control of homeostatic balance.

Anatomy & Physiology

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter13: Anatomy Of The Nervous System

Section: Chapter Questions

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Question

Explain the difference between tonic and antagonistic control of homeostatic balance. Fig. 6.15 Give two examples of each.

ANTAGONISTIC CONTROL
(b) Antagonistic control uses different
signals to send a parameter in
opposite directions. In this
example, antagonistic
neurons control heart rate:
Stimulation by sympathetic nerves increases heart rate.
Heartbeats
some speed it up, while
others slow it down.
2
3
Time (sec) –
Sympathetic
neuron
Parasympathetic
neuron
Stimulation by parasympathetic nerves decreases heart rate.
Heartbeats
2
3
Time (sec)
? FIGURE QUESTION
What heart rates (in beats/min)
are shown on the two ECG
tracings?

TONIC CONTROL
(a) Tonic control regulates physiological parameters
in an up-down fashion. The signal is always present
but changes in intensity.
Decreased signal rate
vessel dilates
Change in
signal rate
Time
Electrical
If the signal rate decreases,
the blood vessel dilates.
signals
from
Time
neuron
derate signal rate
results in a blood vessel
of intermediate diameter.
Increased signal rate
vessel constricts
Time
If the signal rate increases,
the blood vessel constricts.

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