Name the primary hormone responsible for milk ejection reflex______________?
Show answer Hide answer
Answer: A. Oxytocin
Explanation
Oxytocin stimulates the contraction of specialized myoepithelial cells surrounding the mammary gland alveoli. These coordinated contractions force milk out of the alveoli and into the larger lactiferous ducts. This neuroendocrine reflex ensures successful milk ejection during infant suckling events. Oxytocin is synthesized in hypothalamic nuclei and released into the bloodstream from the posterior pituitary gland. Mechanical stimulation of the nipple sends neural signals to the brain to trigger hormone release. Myoepithelial cells respond specifically to circulating oxytocin by contracting around the glandular tissue.
The milk ejection reflex is vital for successful postnatal lactation and adequate infant nourishment. Emotional stress and anxiety can inhibit oxytocin release and temporarily disrupt the milk ejection process. Synthetic oxytocin analogues are sometimes clinically utilized to assist with postpartum uterine contractions and lactation. Estrogen promotes breast tissue development and ductal growth during puberty and pregnancy stages. Progesterone stimulates lobulo-alveolar development in the mammary glands during the gestational period. Prolactin is primarily responsible for milk synthesis within the glandular tissue rather than milk ejection.
Related questions
Q1. The primary feeding and hunger center is located within the________________?
Show answer Hide answer
Answer: A. Hypothalamus
The ventromedial and lateral nuclei located within the hypothalamus function as the primary feeding and hunger centers. Neurological studies confirm that hypothalamic structures integrate hormonal and neural signals to r...
Q2. Hyperkinetic movement disorders such as chorea and athetosis typically stem from pathology within_______________?
Show answer Hide answer
Answer: D. Basal ganglia complex
Hyperkinetic movement disorders like chorea and athetosis stem from basal ganglia pathology. The basal ganglia normally modulate motor control to prevent unwanted excess movements. Option D is correct because these disor...
Q3. Hyperthyroidism may be precipitated by____________?
Show answer Hide answer
Answer: B. Amiodarone
Amiodarone is an iodine-rich antiarrhythmic medication that can induce thyroid dysfunctions including hyperthyroidism. The high iodine content of the drug provides excess substrate for thyroid hormone synthesis in suscep...
Q4. During an isotonic muscle contraction________________?
Show answer Hide answer
Answer: A. The muscle moves a load through a distance
During an isotonic contraction, muscle tension remains constant while the muscle changes length to move a load. Moving a physical load through a measurable distance requires shortening the muscle fibers against a constan...
Q5. Within a DNA molecule, adenine consistently forms specific bonds with______________?
Show answer Hide answer
Answer: C. Thymine
Adenine forms specific complementary hydrogen bonds with thymine in DNA molecules. This strict base-pairing rule maintains the uniform geometry of the double helix. Option C is correct because adenine consistently pairs...
Q6. When antiserum A, antiserum B, and Rh factor are introduced to a blood sample and no agglutination occurs, this indicates_______________?
Show answer Hide answer
Answer: B. O group and Rh- ve
A lack of agglutination with anti-A, anti-B, and Rh antisera indicates blood type O and Rh-negative. Agglutination occurs only when antibodies bind to their specific matching surface antigens on red blood cells. The abse...