Homeostatic control systems

Question 1

Control systems are grouped into two classes:

Answer 1

1- Intrinsic controls:
2- Extrinsic controls:

Question 2

Local controls that are inherent in an organ.

Answer 2

Intrinsic controls:

Question 3

Extrinsic controls: Regulatory mechanisms initiated outside an organ. Accomplished by …… and
…….. systems.

Answer 3

nervous, endocrine

Question 4

Refers to responses made after change has been detected.

Answer 4

Feedback

Question 5

Types of feedback systems:

Answer 5

1. Negative
2. Positive

Question 6

Primary type of homeostatic control (most common).

Answer 6

Negative feedback system

Question 7

It opposes the initial change.

Answer 7

Negative feedback system

Question 8

Monitors magnitude of a controlled variable.

Answer 8

sensor

Question 9

Compares sensor s input with a set point.

Answer 9

Control center

Question 10

Makes a response to produce a desired effect.

Answer 10

Effector

Question 11

1, 2 , 3 , 4

Answer 11

stimulus, sensor, control, effector

Question 12

childbirth

Answer 12

positive feedback

Question 13

………. pushes head to stretch cervix muscle, this will send ……… to the brain (…….. gland) to secrete the …….. hormone which will stimulate the uterine contraction,
this will push the baby more against the ……..more signals to the brain more oxytocin and contactions. This action is repeated until the baby is born.

Answer 13

Uterine contraction, nerve impulses, posterior pituitary, oxytocin, cervix

Question 14

contractions caused even more contractions

Answer 14

positive feedback

Question 15

1

Answer 15

brain stimulates pititiuary gland to secrete oxytocin

Question 16

2

Answer 16

oxytocin carried in bloodstream to uterus

Question 17

3

Answer 17

oxytocin stimulates uterine contractions and pushes baby towards cervix

Question 18

4

Answer 18

head of baby pushes against cervix

Question 19

Stimulation ofr……causes slight leakage of ……. ions.

Answer 19

nerve fiber, sodium

Question 20

More sodium in causes change in …….. potential that will cause more ……..channels to open and
more……..x & more change in membrane potential more opening, until action potential is created and
spread all the way to the end of nerve fiber.

Answer 20

membrane, sodium , influx

Question 21

Can lead to illness and death (in severe cases).

Answer 21

Disruptions in Homeostasis

Question 22

most common factors that can affect the homeostasis:

Answer 22

Genetic factors, Diet and nutrition, or physical
condition.

Question 23

abnormal functioning of the body associated with disease.

Answer 23

Pathophysiology: