Topic 9 Bio

Question 1

Homeostasis definition

Answer 1

Maintenance of a state of dynamic equilibrium despite changes in the external or internal environment

Question 2

What do we need to regulate with homeostasis

Answer 2

pH
Core temperature
Body Fluids - Water

Question 3

Two types of glands and difference

Answer 3

Endocrine gland secretes directly into bloodstream
Exocrine gland releases chemicals (enzymes) via a duct

Question 4

What are hormones

Answer 4

Chemical signals. Either proteins/peptides or steroids

Question 5

What are the neurosecretory cells

Answer 5

nerve cells in the hypothalamus that secrete the message from the hypothalamus to the pituitary gland
Type 1 (releasing factor/ inhibiting factor) - Produce substance that makes or stops hormone being released
Type 2 (hormone itself) - stored in pituitary gland until needed

Question 6

Describe the structure of the pituitary gland

Answer 6

Posterior and anterior putuitary gland

Question 7

What is a tropism

Answer 7

A directional response to specific environmental cues

Question 8

What area of the plant are most sensitive to hormones

Answer 8

Reigon of cell division and elongation

Question 9

What are auxins

Question 10

What is thigmotropism

Answer 10

Climbing plants have a sense of touch. They sense where the object and spiral around it