Question 7
- State three differences between the endocrine gland and exocrine gland.
- Complete the table below by naming two examples of each of the glands in 7(a) and state one secretion of each.
|
Two examples of gland |
One secretion of each gland |
Endocrine gland |
|
|
|
|
|
Exocrine gland |
|
|
3.Name the three main types of neurons.
4.Give three examples of reflex actions
Observation
Majority of the candidates avoided this question.
In part (a), majority of the candidates could not differentiate between endocrine glands and exocrine glands.
In part (b), majority of the candidates were able to give two examples of exocrine and endocrine glands as well as the names of their secretions.
In par (c), majority of the candidates correctly named three types of neurons.
In part (d), majority of the candidates gave three examples of reflex actions.
The expected answers are:
- (a) Differences between Endocrine gland and Exocrine gland
Endocrine gland |
Exocrine gland |
Secretes directly into the blood streams |
Secretes through duct |
Secretions affect target organs/tissues |
Secretion acts directly on food substances |
Point of secretion/glands is far from target organs/tissues |
Point of secretion/glands not far from food substances |
Secretes hormones |
Does not secrete hormones |
Note: Differences must correspond to score
(b)
|
Two examples of gland |
One secretion of each gland |
Endocrine gland |
Thyroid |
thyroxin |
Exocrine gland |
Salivary gland |
Saliva/salivary amylase |
Note: Spelling of names must be correct to score
(c) Types of neurons
- Sensory/afferent neurone
- Motor/efferent neurone
- Intermediate/association neurone/interneuron/relay neurone
(d) Examples of reflex actions/involuntary action
- Blinking of eye
- Jerking of knee
- Salivation
- Coughing
- Heartbeat
- Withdrawing of body part /named from a hot object/named
- Peristalsis
- Secretion of glands
- Yawning
- Sneezing
- Shivering