F214 Definitions

Question 1

Negative Feedback

Answer 1

Process in which any change within a parameter bring about the reversal of that change so the condition is kept fairly constant.

Question 2

Positive Feedback

Answer 2

Process in which any change in a parameter brings about an increase in that change e.g oxytocin release in birth.

Question 3

Homeostasis

Answer 3

Maintenance of constant internal environment within a parameter despite external change.

Question 4

Endotherm

Answer 4

Organism that can control production and loss of heat to maintain their body temperature.

Question 5

Endocrine Gland

Answer 5

Gland which secretes hormones directly into blood capillaries.

Question 6

Exocrine Gland

Answer 6

Gland which secretes substances into a duct.

Question 7

Hormones

Answer 7

Molecules secreted into blood that acts as a chemical receptor.

Question 8

Target Tissue

Answer 8

Cells that have receptors in CSM that are complementary in shape to a specific hormone.

Question 9

Excretion

Answer 9

Removal of metabolic waste from the body.

Question 10

Autotroph

Answer 10

Organism that makes own food using simple inorganic molecules and light energy (photoautotroph) or chemical energy (chemoautotroph).

Question 11

Heterotroph

Answer 11

Organism that digests another organism to use their complex organic molecules to release energy.

Question 12

Photosynthetic Pigments

Answer 12

Molecules that absorb light energy, each pigment absorbs a range of wavelengths in the visible region and has its own distinctive peak of absorption.

Question 13

Respiratory Substrate

Answer 13

Organic molecules respired to release energy.