University:
High School
Course:
High School Biology
Academic year:

2023
Views:

357

Pages:

2
Author:

Yusuf Johnson

What does the Endocrine System Do? Endocrine System The body’s slower, chemical communication system Uses chemical signals for cell to cell communication – this is why it is slower than the nervous system Coordinates the function of cells – e.g. cells in the uterus need to know when cells in the ovaries are active Responds to information from the brain to keep body chemistry balanced- homeostasis What do these glands influence? Glands of the Endocrine System and their location Thyroid gland – can increase protein production and oxygen use by cells. Also regulates calcium levels Pancreas – regulates the level of sugar in the blood by secreting insulin. Thymus – helps the body make a type of white blood cell. These cells help protect you from infections. Hypothalamus: The master control gland that is located in the brain Pituitary Gland: The 2nd master gland – that reacts to the hypothalamus, affects growth and controls other endocrine glands What do these glands influence? Pineal --secretes melatonin helps to regulate daily biological rhythms and promotes sleep. Ovary – secretes female sex hormones such as estrogen 1 Testes – secrete male sex hormone such as testosterone How are the brain and hormones connected? Negative feedback loop (like a thermostat) aka: Androgens Adrenal Gland secrete epinephrine and norepinephrine (aka: Adrenaline ) which help to arouse the body in times of stress (fight or flight responses) Brain Glands Body HOMEOSTASIS –balanced internal environment Feedback Controlling Body Temperature nerve signals hypothalamus sweat dilates surface blood vessels high body temperature (37°C) low hypothalamus constricts surface blood vessels shiver nerve signals 2