Lesson 5
Learning Objectives
1.Define a hormone
2.State the role of the hormone adrenaline in boosting
the blood glucose concentration and give examples of
situations in which this may occur.
Outline
• What is hormone?
• Endocrine glands
• Adrenaline
Hormone
Hormones are chemical substances secreted by endocrine
glands or ductless glands directly into the bloodstream.
• The blood carries the hormones to all parts of the body and
affects organs sensitive to them.
• 2 types of hormones:
– short lasting (ADH, insulin) and long lasting (sex hormone).
• These hormones are then destroyed in the liver and excreted
by kidneys.
• The endocrine system and the nervous system cooperate to
coordinate the body's activity.
Endocrine Glands
Endocrine glands
are ductless glands
that are
responsible for
secreting
chemicals called
hormones in small
quantities directly
into the
bloodstream.
Adrenaline
• Adrenaline is a hormone secreted by adrenal
glands which are situated just above the
kidneys.
• It is secreted during conditions of fear, anxiety
and stress.
Thumping Heart
Dry mouth
Tense feeling,
shivering
“Hollow feeling” in
stomach
Person becomes paler
Panting
Effects of Adrenaline
• Prepare the body for “Fight or Flight”.
Effects of Adrenaline
Learning Objectives
1.Define a hormone
2.State the role of the hormone adrenaline in
boosting the blood glucose concentration and
give examples of situations in which this may
occur.