Nervous System And Sensory Organs

Question 1

Neurons

Answer 1

Nerve cells

Question 2

Sensory neurons

Answer 2

Sense the stimulus and send messages to interneurons. Part of peripheral nervous system

Question 3

Interneurons

Answer 3

Carry impulses through spinal cord to brain and back, and sends messages to motor neurons. Part of central nervous system.

Question 4

Motor neurons

Answer 4

Receive impulses from interneurons. Causes response in effector organs.(muscles or glands).

Question 5

Homeostasis

Answer 5

Constant maintenance of internal temperature, ph, and concentrations of ions, glucose, water and carbon dioxide.

Question 6

Stimulus - response

Answer 6

The response made by the body when receiving stimulus.

Question 7

Stimulus - response model

Answer 7

Model describe how body reacts to stimulus

Goes: stimulus -> receptor -> control centre -> effector -> response

Question 8

Receptors

Answer 8

Identifies changes inside and out of the body.

4 types of receptors: photoreceptors, mechanoreceptors, chemoreceptors, thermoreceptors.

Question 9

Effectors

Answer 9

Muscle or glands that receive messages from central nervous system and respond based on original stimulus.

Question 10

Negative feedback system

Answer 10

When feedback is opposite direction of the stimulus. (eg. Chemical blood levels are too high, body lowers it.)