Name: rest and digest: parasympathetic control
Uploaded: 2019-03-11T09:21:26.000Z
Duration: 1 min 14 s
Channel: JoVE

K12 Standards

Next Generation Science Standards

High School

Life Science

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms: Structures and Processes

HS-LS1-2

The Parasympathetic Nervous System

- [Eğitici] Parasempatik sinir sistemi, tehditin bulunmadığı sakin zamanlarda vücudu iyileştirir ve genellikle dinlenme ve sindirim sistemi olarak adlandırılır.
 Viseral organlardaki düz kas, kalpteki kalp kası ve tükürük bezleri gibi bazı bezlerin aktivitesini düzenleyerek istemsiz fonksiyonları kontrol eden, otonom sinir sisteminin en önemli bölümlerinden biridir.
 Parasempatik sinir sistemi aktive edildiğinde, beyin sapındaki ve omuriliğin sakral bölümündeki preganglionik nöronlardan gelen sinyaller gangliyonlara gönderilir.
Gangliyonlar, periferik sinir sisteminde, kontrol edilen organların veya bezlerin yakınındaki nöronal hücre gövdesi kümeleridir.
 Burada mesaj, tipik olarak, hedef dokuların aktivitesini düzenlemek için nörotransmiter asetilkolinini kullanan postgonglionik nöronlara iletilir.
 Örneğin bunlar kalp atışlarını düşürür, vücudu gevşetir ve bağırsaklarda ve mesanede kas kasılmasını uyarır, sindirimi ve atılımı destekler.
Sonuç olarak, parasempatik sistem enerji depolarını yeniden doldurmaya ve vücudun dinlenebildiği zamanlarda homeostazı sürdürmeye yardımcı olur.

Stewart, Julian M. "Ortostatik İntoleransın Yaygın Sendromları." Pediatri 131, hayır. 5 (Mayıs 2013): 968–80. [<a href="https://doi.org/10.1542/peds.2012-2610" target="__blank">Kaynak</a>]

parasempatik sinir sistemi

<h4>Genel bakış</h4>

Parasempatik sinir sistemi, otonom sinir sisteminin iki ana bölümünden biridir. Parasempatik sistem, kalp atış hızı ve sindirim gibi birçok bilinçsiz fonksiyonun düzenlenmesinden sorumludur. Hem beyinde hem de periferik sinir sisteminde bulunan ve aksonlarını hedef kaslara, organlara ve bezlere gönderen nöronlardan oluşur.

<h4>"Dinlenme ve Sindirme" Sistemi</h4>

Parasempatik sistemin aktivasyonu, vücut üzerinde rahatlatıcı bir etkiye sahip olma eğilimindedir ve kaynakları yenileyen ve homeostazı geri kazandıran işlevleri teşvik eder. Bu nedenle bazen ”dinlenme ve sindirim" sistemi olarak adlandırılır. Parasempatik sistem, saldırı veya zarar tehdidi olmadan temel “bakım” işlevlerine kaynak ayırmanın güvenli olduğu sakin zamanlarda baskındır.

<h4>Parasempatik Sistemin Kontrolü</h4>

Parasempatik sinir sistemi, hipotalamus da dahil olmak üzere beynin çeşitli kısımları tarafından aktive edilebilir. Beyin sapındaki ve omuriliğin sakral kısmındaki preganglionik nöronlar önce aksonlarını periferik sinir sisteminde ganglionlara -nöronal hücre gövdelerinin kümelerine-gönderir. Bu ganglionlar, pre- ve postganglionik nöronlar arasındaki bağlantıları içerir ve kontrol ettikleri organların veya bezlerin yakınında bulunur. Buradan, postganglionik nöronlar aksonlarını hedef dokulara, genellikle düz kaslara, kalp kaslarına veya bezlere gönderir. Tipik nörotransmitter olarak asetilkolin bu hedeflerin aktivitesini düzenlemek için kullanılır.

Parasempatik sistemin aktivasyonu vücut üzerinde çeşitli etkilere neden olur. Kalp atış hızını düşürür ve göz bebeğinin daralmasına neden olur, vücudu daha rahat bir duruma getirir. Ayrıca sindirim ve atılımı uyarır; örneğin, tükürük salgısını, mide ve bağırsaklarda peristaltik kasılmaları ve idrar çıkarmak için mesanenin kasılmasını teşvik ederek. Pankreasın daha fazla insülin salgılamasına neden olarak enerji depolarını yeniden yapılandırmaya yardımcı olur. Son olarak, cinsel organlara kan akışını artırarak üremeyi bile teşvik eder.

<h4>Ayakta Durmak</h4>

Kalp atış hızı ve kan akışının kontrolü, ayakta durma gibi sıradan görevler için bile gereklidir. Ortostatik intoleranstan (OI) muzdarip insanlar, ortostaz adı verilen dik bir duruşa girme gibi basit bir eylemin ardından kronik baş dönmesi ve bayılma yaşayabilirler. Otonom sinir sistemi, ortostazla karşılaştığımızda vasküler sistem ve kalp atış hızındaki gerekli değişiklikleri kontrol eder. Özellikle, parasempatik sistem, serebral arterlerin vazodilatasyonuna -kan damarlarını kaplayan kasların gevşemesine- izin veren sinyallerden sorumludur. Parasempatik sinir sistemi tarafından yanlış sinyalleme, beyne yetersiz kan akışı nedeniyle bilinç kaybına neden olabilir.

Parasempatik Sinir Sistemi

Genel bakış

Parasempatik sinir sistemi, otonom sinir sisteminin iki ana bölümünden biridir. Bu parasempatik sistem sorumludur ...

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rest and digest: parasympathetic control

The parasympathetic nervous system helps the body stay calm and return to a rested state. It is one of the two major divisions of the autonomic nervous system, which controls many unconscious functions such as heart rate and digestion. Its neurons are found in the brain and the peripheral nervous system, and they send axons to muscles, organs, and glands.

This system is often called the “rest and digest” system because it supports body processes that restore homeostasis. It is most active during calm times, when the body can focus on basic housekeeping functions instead of responding to danger. In this state, the body can use resources for recovery and maintenance.

The parasympathetic nervous system can be activated by parts of the brain, including the hypothalamus. Preganglionic neurons in the brainstem and sacral spinal cord send axons to ganglia, which are clusters of neuronal cell bodies in the peripheral nervous system. These ganglia lie near the organs or glands they control, where they link preganglionic and postganglionic neurons.

Postganglionic neurons then carry signals to target tissues, which are usually smooth muscle, cardiac muscle, or glands. The neurotransmitter acetylcholine is typically used to control these targets. When this system is active, heart rate decreases, pupils constrict, digestion and excretion increase, and the pancreas releases more insulin to help rebuild energy stores. It also increases blood flow to the genitals, which supports reproduction.

This control system is also important during standing up. People with orthostatic intolerance, or OI, can feel lightheaded or faint when they move into an upright posture, a change called orthostasis. The autonomic nervous system adjusts heart rate and blood vessels during this shift, and the parasympathetic system helps signals that allow vasodilation, or widening of the cerebral arteries. If this signaling does not work properly, the brain may not get enough blood, which can cause loss of consciousness.

Rest and Digest: Parasympathetic Control

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The nervous system is a network of specialized cells that keeps the body working and helps it respond to the world around it. It controls essential functions such as heart rate and breathing. It also supports movement that helps an organism escape danger. In vertebrates, the nervous system has two major parts: the central nervous system, or CNS, and the peripheral nervous system, or PNS. The CNS includes the brain, spinal cord, and retina, which is the sensory tissue of the visual system. The...

the parasympathetic nervous system

The parasympathetic nervous system helps the body stay calm and return to a rested state. It is one of the two major divisions of the autonomic nervous system, which controls many unconscious functions such as heart rate and digestion. Its neurons are found in the brain and the peripheral nervous system, and they send axons to muscles, organs, and glands. This system is often called the “rest and digest” system because it supports body processes that restore homeostasis. It is most active...

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Sympathetic Stress Response and Body Changes

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key terms and concepts

Learn how the parasympathetic nervous system slows heart rate, supports digestion, and helps the body adjust when standing up.

Rest and Digest: Parasympathetic Control | JoVE K12

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Overview

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Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms. [Clarification Statement: Emphasis is on functions at the organism system level such as nutrient uptake, water delivery, and organism movement in response to neural stimuli. An example of an interacting system could be an artery depending on the proper function of elastic tissue and smooth muscle to regulate and deliver the proper amount of blood within the circulatory system.] [Assessment Boundary: Assessment does not include interactions and functions at the molecular or chemical reaction level.]

What is Homeostasis?

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Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis. [Clarification Statement: Examples of investigations could include heart rate response to exercise, stomate response to moisture and temperature, and root development in response to water levels.] [Assessment Boundary: Assessment does not include the cellular processes involved in the feedback mechanism.]

HS-LS1-3

Rest and Digest: Parasympathetic Control

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