Part 3 Topic B

Question 1

what plays a key role in the ability to maintain homeostasis in the face of changing environmental conditions?

Answer 1

the autonomic nervous system

Question 2

maintaining homeostasis requires:

Answer 2

work, the organism has to “actively” maintain a steady state

Question 3

negative feedback

Answer 3

describes the effect in which the final product of a biochemical pathway inhibits the first step; the process in which a stimulus acts on a sensor that communicates with an effector, producing a response that opposes the initial stimulus. Negative feedback is used to maintain steady conditions, or homeostasis

Question 4

homeostatic regulation relies on:

Answer 4

negative feedback

Question 5

what is thermoregulation?

Answer 5

the ability to maintain a constant body temperature

Question 6

homeostasis

Answer 6

the active regulation and maintenance, in animals, organs, or cells, of a stable internal physiological state in the face of a changing external environment

Question 7

how does the endocrine system maintain homeostasis?

Answer 7

depends on feedback from the target organ to the endocrine gland that secretes the hormone which increases/decreases its subsequent production of hormone

Question 8

hormones are transmitted through the:

Answer 8

bloodstream - feedback can occur over varying distances

Question 9

positive feedback

Answer 9

in the nervous system, the type of feedback in which a stimulus causes a response that leads to an ENHANCEMENT of the original stimulus that leads to a larger response. In the endocrine system, the type of feedback in which a stimulus cases a response, and that responses causes a further response in the same direction. In both cases, the process reinforces itself until interrupted

Question 10

what are four things always involved in a system of feedback?

Answer 10

stimulus–sensor–effector–response

Question 11

constant feedback between the response and sensor maintains a set point, meaning…

Answer 11

homeostasis is an active process

Question 12

the sensor and effector may be…

Answer 12

a single cell, an endocrine organ, or a series or endocrine organs

Question 13

diabetes mellitus

Answer 13

a disease that results when the control of blood-glucose levels by insulin fails

Question 14

positive feedback provides enhancement that allows for:

Answer 14

accelerated responses of target cells for a period of time

Question 15

a positive feedback loop reinforces itself until:

Answer 15

it is interrupted or broken by some sort of external signal outside the feedback loop but from within the body ex. giving birth