& x20;Oxytocin is mainly involved in which of the following functions? - NORCET 1 - 2020

NORCET 1 - 2020

Applied Physiology

Easy

Appeared in: NORCET 1 - 2020

Explanation

Oxytocin is a hormone released from the posterior pituitary gland.
Its primary function is to stimulate uterine smooth muscle contractions during childbirth (parturition).
It also causes the contraction of myoepithelial cells in the breast, leading to the milk ejection or 'let-down' reflex during lactation.
The release of oxytocin during labor is part of a positive feedback loop: cervical stretching triggers oxytocin release, which causes stronger contractions, leading to more stretching.

Option A: Motor skills are complex functions controlled by the brain, specifically the motor cortex, cerebellum, and basal ganglia, not by the hormone oxytocin.
Option C: Growth is primarily regulated by Growth Hormone (GH) and thyroid hormones. Mental ability is a multifactorial cognitive function, not directly controlled by oxytocin.
Option D: Blood pressure is mainly regulated by the Renin-Angiotensin-Aldosterone System (RAAS), the autonomic nervous system, and Antidiuretic Hormone (ADH/vasopressin). Oxytocin is not a primary regulator of blood pressure.

Visual 1: Diagram: A flowchart illustrating the positive feedback mechanism of oxytocin during labor, showing how cervical stretch leads to oxytocin release and stronger uterine contractions.
Visual 2: Illustration: A diagram of the breast showing the milk ejection reflex, with oxytocin stimulating myoepithelial cells to eject milk from the alveoli into the ducts.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Primary physiological functions of the hormone oxytocin as background academic context rather than a clinical decision trigger.
Synthetic oxytocin (Pitocin) is one of the most common drugs used in obstetrics. Nurses frequently administer it to induce or augment labor and to control postpartum hemorrhage by ensuring the uterus contracts firmly after delivery.
Nurses must carefully monitor the rate of oxytocin infusion, the frequency and duration of uterine contractions, and the fetal heart rate to prevent complications like uterine hyperstimulation, which can lead to fetal distress or uterine rupture.
What if? If a patient receiving oxytocin for labor augmentation develops uterine tachysystole (more than five contractions in 10 minutes), the nurse's first action is to decrease or stop the oxytocin infusion and notify the provider, as this can compromise fetal oxygenation.

How to Approach the Question

First, identify the keyword in the question stem, which is 'Oxytocin'.
This is a factual recall question. Access your knowledge about the endocrine system and the specific functions of hormones from the posterior pituitary.
Recall the two main hormones of the posterior pituitary: Oxytocin and Antidiuretic Hormone (ADH).
Remember the primary roles of oxytocin: stimulating uterine contractions for childbirth and promoting milk ejection for lactation.
Evaluate the given options. 'Childbirth and lactation' directly matches the known primary functions of oxytocin.
Briefly consider the other options to confirm they are incorrect. Motor skills (nervous system), growth (GH), and blood pressure regulation (ADH, RAAS) are governed by different systems/hormones.

Concept Tested & Keywords

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