Week 6 homework Chemical control
1.State two reasons why the body would use hormones rather than electrical impulses to
send messages.
Hormones are a slow process taking minutes, hours or days to take full effect this is good,
as not all responses need to be fast. Also hormones are longer lasting compared to
electrical impulses.
2. Recall the endocrine system by matching:
Gland
Hormone
3. A. Describe what hormones are. Hormones are produced by the endocrine glands and
these hormones control growth and development, water balance, sexual reproduction and
the rate of chemical reactions in cells.
B State where they are produced. C Describe how they are transported. Hormones are transported through the blood.
4. Outline how hormones recognize their target cells. The hormones have a target cell.
The hormone has a specific shape that matches the receptor or the target this way the
right hormones reach the right cell. This system means they wont get mixed up.
5. Specify which endocrine gland could be called the ‘master’ gland. Explain why.
6. Listed below are several symptoms of stress caused by the release of adrenalin.
Explain how each plays a role in preparing the body for action when stressed:
• Increased heart rate • Dilation of bronchioles
• Glucose release from the liver
• Increased-breathing rate
7. Describe a situation in which the response of the body is controlled by both the
nervous and endocrine systems. Fear is a good example because if you are scared of
something the nervous will send an immediate reaction, which may cause a reflex action.
The endocrine system would release the adrenal hormone or the ‘flight or fight’ hormone.
8. Outline the hormones involved in growth and the refection the body.
9. Predict whether administering thyroxin would have any effect on an adult with
cretinism.
10.Explain why dogs take so much interest in each other’s urine and faeces.
11. The diagram in Figure4.6.11 shows several endocrine glands labeled using the letters
K to P.Use the letters K to P to identify which gland produces a hormone that controls:
a. Blood glucose levels
b. Female reproductive functions
c. Rates of chemical reactions in cells
d. Water levels within the body
e. Readiness of the body for action
f. Deepening of the male voice at puberty
12. Calculate the percentage of diabetics that suffer from Type I diabetes and the
percentage that suffer from Type II.
13. Identify two examples of pheromones and describe their effects.
14. Distinguish between a pheromone and a hormone.
15. Construct a table to compare the nervous and endocrine systems. Your table should
include comparisons of the nature of the message produced, how the message is
distributed, speed of delivery and length of response produced.
16 Propose reasons why perfume and after shave producers carry out a lot of research
into finding human pheromones.
17 UsingFigure4.6.9asaguide,constructaflowcharttoshow the body’s response to a
decrease in blood glucose levels.
18 Construct a sketch graph showing what happens to your blood glucose levels after you
eat a lolly.