Hormones

Question 1

What are hormones?

Answer 1

A hormone is a chemical substance, produced by a gland and carried in the bloodstream, which alters the activity of specific target organs.

Question 2

What happens to a hormone after its used?

Answer 2

it is destroyed by the liver.

Question 3

Describe the effects of hormones

Answer 3

Hormones are a chemical type of signal which travels through the blood stream which have long lasting effects but are slow to take place.

Question 4

Thyroid gland

Answer 4

thyroxine

Question 5

pituitary gland

Answer 5

• anti-diuretic hormone
• Controlling the water content of the blood
• Increases reabsorption of water by the collecting ducts
• The hypothalamus detects changes in hormone levels and will release hormones which control the pituitary gland or other organs.
• The hormones from the hypothalamus and pituitary can also act on other glands to stimulate the release of different types of hormones and bring about effects.

Question 6

pancrease

Answer 6

insulin which targets liver and controls blood glucose levels,and Increases conversion of glucose into glycogen for storage

Question 7

ovaries

Answer 7

oestrogen

Question 8

adrenal glands

Answer 8

adrenaline, targets organs in the respiratory and circulatory systems. Preparation for ‘fight or flight’. Increases breathing rate, heart rate, flow of blood to muscles, conversion of glycogen to glucose

Question 9

What is homeostasis?

Answer 9

this is the maintenance of constant internal conditions in an organism.