Starter quiz
The image shows glands of the endocrine system. What are the circled glands called?- thyroid glands
- pancreas
- adrenal glands ✓
- ovaries
-
- Which hormone is secreted by the adrenal glands?
- thyroxine
- oestrogen
- adrenal stimulating hormone (ASH)
- adrenaline ✓
-
- Which gland in the human body is involved in regulating metabolism?
- pancreas
- thyroid gland ✓
- testes
- adrenal gland
-
- What is the name of the hormone secreted by the thyroid gland?
- insulin
- thyroxine ✓
- testosterone
- thyroid stimulating hormone (TSH)
-
- Which gland is known as the master gland?
- pituitary gland ✓
- hypothalamus
- pancreas
- ovaries
- thyroid gland
-
- Regulation of constant internal conditions for optimum enzyme activity and cell function is called ...
- 'homeostasis' ✓
Exit quiz
- Match the hormone to the gland that it is secreted by.
- adrenaline⇔adrenal gland ✓
- TSH⇔pituitary gland ✓
- thyroxine⇔thyroid gland ✓
- TRH⇔hypothalamus ✓
- Which of the following correctly describe the effect of adrenaline on the body?
- Decreased breathing and heart rate.
- Stored glycogen is converted to glucose. ✓
- Blood is diverted to major limb muscles. ✓
- Pupils dilate to become smaller in size.
-
- What is the mechanism called where the body detects changes in conditions, then reverses these changes to bring levels back to normal?
- 'negative feedback' ✓
- Put these steps in order to show the body's response to low levels of thyroxine.
- 1⇔Low thyroxine levels are detected.
- 2⇔The hypothalamus is stimulated to secrete TRH.
- 3⇔The pituitary gland secretes TSH.
- 4⇔The thyroid gland is stimulated to produce thyroxine.
- 5⇔Thyroxine levels increase back to normal.
- Which of the following statements are true when thyroxine levels are too high?
- The hypothalamus secretes more TRH.
- The hypothalamus inhibits TRH. ✓
- There is more TSH available to stimulate the thyroid gland.
- TSH in inhibited and so does not stimulate the thyroid gland. ✓
-
The graph below shows changes in thyroxine over time. Which statements about the graph are correct?- At point B TRH and TSH are being secreted.
- At point D TRH and TSH are being secreted. ✓
- At point B TSH is being inhibited. ✓
- At point D TSH is being inhibited.
-
Worksheet
Loading worksheet ...
Presentation
Loading presentation ...
Video
Lesson Details
Key learning points
- The hormone adrenaline is secreted by the adrenal gland during stress; it causes the body to prepare for rapid action.
- The hormone thyroxine is secreted by the thyroid gland; it controls growth and the rates of chemical reactions in cells.
- The pituitary gland secretes hormones that control other glands.
- Hypothalamus secretes TRH; this causes pituitary gland to secrete TSH; this causes thyroid gland to secrete thyroxine.
- Thyroxine causes the pituitary gland to stop secreting TSH; this is an example of negative feedback.
Common misconception
Negative feedback only works to reverse high levels back to normal.
The slide deck has several slides where changes are described as being high and low and there is a CFU question in the final learning cycle that specifically assesses this misconception.
Keywords
Adrenaline - A hormone secreted by the adrenal glands in times of fear or stress.
Thyroxine - A hormone secreted by the thyroid gland that stimulates the basal metabolic rate.
Negative feedback - A mechanism where changes to conditions cause an action to reverse the change, keeping conditions stable.
Gland - An organ or tissues that produces and secretes substances, such as hormones.
+