The document provides an overview of the endocrine system, including:
- The endocrine system secretes hormones directly into the bloodstream to regulate functions, unlike the nervous system.
- Hormones include steroidal hormones like estrogen and cortisol, and nonsteroidal hormones made of proteins.
- Negative and positive feedback loops control hormone levels.
- Key endocrine glands are the hypothalamus, pituitary gland, thyroid gland, parathyroid glands, adrenal glands, pancreas, and gonads.
- Stress causes the release of hormones that increase heart rate, respiration, blood glucose/fatty acids, and can suppress the immune system if prolonged.
- Common endocrine