Homeostasis and Feedback Mechanisms

Question 1

homeostasis

Answer 1

• a series of control mechanisms that ensure our bodies maintain a constant temperature, steady water levels, and ions and blood sugar
• enables cells to work at their optimum conditions which include pH, temperature, ion, and gas concentration
• if these systems become disrupted, teh endocrine and nervous system work together to maintain homesostasis

Question 2

Which responds quicker: the nervous system or the endocrine system?

Answer 2

the nervous system

Question 3

which system responds with longer, more lasting responses: the nervous system or the endocrine system?

Answer 3

the endocrine system

Question 4

Negative feedback loops

Answer 4

• occur when your body needs to slow down or completely stop a proccess that’s happening. The origional stimulus is reversed so that the body reterns to “normal”
• goes back and forth (ex. turning heat up, but then ur too hot, so you turn it down, but then u get cold, so u turn it back up, and the process repeats)

Question 5

Positive Feedback Loops

Answer 5

• occurs when you need to amplify or increase your body’s response to a stimulus. The change occurs in one similar direction and continues until something stops it

ex. you get a cut, things are sent to heal it, until it’s closed

Question 6

The Nervous System

Answer 6

• consists of the brain, spinal cord, sensory organs, ad all the nerves that connect the organs with the rest of the body
• together, they control the body through quick, immediate, responses using specialized cells called neurons
• our sense organs recieve signals from the stimuli and transmit that information through sensory neurons to teh brain
• brain processes the information and makes decisions on how to respond
• this is relayed through motor neurons, which may cause you to move, talk, feel, or shiver to restore homeostasis

Question 7

neurons

Answer 7

• transmit electrochemical impuses from one part of the body to another via action potentials

Question 8

nervous system path

Answer 8

neurons transmit electrochemical impulses –> sense organs –> brain –> motor neurons

Question 9

the endocrine system

Answer 9

• made up made up of glands, which secrete hormones directly into the bloodstream
• responds to stimuli to maintain homeostasis
• works with the nervous structure through structures in the brain like hypothalamus

Question 10

process endocrine and nervous system undergo to maintain homeostasis

Answer 10

stimulus (input) –> producing a signal (hormone or neuron firing) –> response (output)

known as feedback loops

Question 11

hypothalamus

Answer 11

• found next to the pituitary gland inside the brain
• it links the nervous system and endocrine system
• controls the secretions of the pituitary gland, which produces hormones that are sent all over the body
• the activity levels of it depend on the level of hormones already present in the blood

Question 12

hormones

Answer 12

• chemical messengers that target a specific group of cells, in order to cause that group of cells to do some activity or stop doing an activity
• hormone levels affect everything from growth, feeling hungry, sugar levels and sexual reproduction
• they act by binding to chemical receptors on specific cells called target cells
• the effects of hormones in the endocrine system are usually slower and longer lasting than those of the nervous system