17: Endocrine, Musculoskeletal and Nervous Systems
- Page ID
- 122834
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- 17.1: Endocrine System
- Hormones cause cellular changes by binding to receptors on or in target cells. The number of receptors on a target cell can increase or decrease in response to hormone activity. Hormone levels are primarily controlled through negative feedback, in which rising levels of a hormone inhibit its further release. The pituitary gland is located at the base of the brain. The anterior pituitary receives signals from the hypothalamus and produces six hormones.
- 17.3: Nervous System
- The nervous system is made up of neurons and glia. Neurons are specialized cells that are capable of sending electrical as well as chemical signals. Most neurons contain dendrites, which receive these signals, and axons that send signals to other neurons or tissues. Glia are non-neuronal cells in the nervous system that support neuronal development and signaling. There are several types of glia that serve different functions.