Endocrine Glands Chemical Messengers Autocrine self signal Paracrine
- Slides: 16
Endocrine Glands
Chemical Messengers • Autocrine • self signal • Paracrine • neighbor signal • Endocrine • distant signal • Pheromone • airborne signal • same species • Allomone • airborne signal • different species
Hormone Types
Homeostasis Mechanism Receptors input signals skin responds to cold temperature sends signal to brain Control Center integrating center brain interprets temp signal makes you shiver Effectors output mechanism muscles shiver creating heat
Negative Feedback Results in an immediate reversal of the imbalanced system Immediately negates the disruption Most systems in the body work via negative feedback systems temperature glucose balance water balance blood pressure
Positive Feedback Immediate further disruption of the imbalance so as to later return to homeostasis childbirth ovulation
Positive Feedback: Childbirth
Neuroendocrine Reflex Baby suckling stimulates receptors on the nipple Action potential travels to the hypothalamus Hypothalamus sends oxytocin to posterior pituitary gland Posterior pituitary releases oxytocin into the blood stream Oxytocin travels to the breast and triggers milk release
Posterior Pituitary Hormones synthesized in the hypothalamus Released by the posterior pituitary • Oxytocin • milk ejection • orgasm • Vasopressin or ADH • water balance • blood pressure
Anterior Pituitary Releasing hormones synthesized in the hypothalamus • CRF/CRH • Gn. RH • GHRH • TRH • PRH Triggers hormone release in anterior pituitary • ACTH • LH/FSH • GH • TSH • PRL
The Stress Continuum
Stress The process by which we perceive and respond to certain events, called stressors, that we appraise as threatening or challenging
HPA Axis Hypothalamus • CRF/CRH Pituitary • ACTH Adrenals • Cortisol
Stress and Hormone Release
Stress Diathesis Model Existing Correlations: • Adult Depression : Elevated Cortisol levels • Childhood Abuse : Adult Depression Stress Diathesis Model: • Genetic Predisposition plus • Early Abuse/Neglect leads to • Adult Depression Animal Model shows: • More CRF neurons • Larger CRF neurons • More sensitive CRF neurons Early abuse permanently alters the stress response increasing the risk of depression
General Adaptation Syndrome (GAS) 1. Alarm Reaction 2. Resistance Reaction 3. Exhaustion
- Chemical messengers of the nervous system
- Persamaan antara sistem saraf dan endokrin
- Phosphorylation cascade
- Autocrina
- Epithelia
- Major endocrine glands male and female
- Endocrine system organs
- Difference between endocrine and exocrine glands
- Exocrine glands are ductless
- Endocrine glands
- Whats the difference between endocrine and exocrine glands
- Endocrine glands
- Endocrine glands
- Endocrine glands secrete
- Endocrine glands
- Endocrine glands
- Endocrine glands