Organisms’ response – Homeostasis Questions
and Answers
What is homeostasis? - ✅✅The ability to maintain a relatively stable internal environment in an ever-
changing outside world
Why is homeostasis important? - ✅✅It maintains the conditions needed for enzymes to function at
their optimum in order for bodily functions to be carried out
List examples of factors controlled by homeostasis. - ✅✅- Core body temp
- Metabolic waste
- Blood pH
- Blood glucose
- Water potential of blood
- Respiratory gas concentration in blood
What are the systems in mammals that information for maintaining homeostasis are managed in? -
✅✅- Endocrine system
- Nervous system
What is the endocrine system? - ✅✅A collection of glands that produce hormones
What are the glands in the endocrine system? - ✅✅Pituitary, thyroid, adrenal, ovaries/testes,
pancreas
What is the difference between endocrine and exocrine glands? - ✅✅- Endocrine - only hormone
producing
- Exocrine - hormone producing glands that also produce non-hormone secretions e.g. pancreas
, Where are hormones targeted on cells? - ✅✅They target cells with receptors that are complimentary.
They will not work on other cells
What make the endocrine glands well adapted? - ✅✅- Good blood supply so hormones can easily
enter blood stream
- Hormones only target cells with the right receptors
List the general qualities of hormones. - ✅✅- Small molecules
- Have very specific shapes
- Secreted by endocrine glands
- Transported in blood in low concentrations
- Have widespread, slower affect
- Secreted fast
- Affects target cells
- Short life span in the body
Why is it important that hormones have a short life span in the body? - ✅✅Because otherwise they
would continue their action which would take the factor away from the optimum in the opposite
direction
Understand the main differences between hormones and nervous responses. - ✅✅See booklet page
72
How do the majority of homeostatic control mechanisms work? - ✅✅They use negative feedback
What is negative feedback? - ✅✅A response to a change in the body that counteracts or opposes the
initial change (in either direction)
Describe how negative feedback works. - ✅✅1. Receptor detects stimulus that is out of normal range
or nearing this point
2. A coordination system transfers information between different parts of the body
and Answers
What is homeostasis? - ✅✅The ability to maintain a relatively stable internal environment in an ever-
changing outside world
Why is homeostasis important? - ✅✅It maintains the conditions needed for enzymes to function at
their optimum in order for bodily functions to be carried out
List examples of factors controlled by homeostasis. - ✅✅- Core body temp
- Metabolic waste
- Blood pH
- Blood glucose
- Water potential of blood
- Respiratory gas concentration in blood
What are the systems in mammals that information for maintaining homeostasis are managed in? -
✅✅- Endocrine system
- Nervous system
What is the endocrine system? - ✅✅A collection of glands that produce hormones
What are the glands in the endocrine system? - ✅✅Pituitary, thyroid, adrenal, ovaries/testes,
pancreas
What is the difference between endocrine and exocrine glands? - ✅✅- Endocrine - only hormone
producing
- Exocrine - hormone producing glands that also produce non-hormone secretions e.g. pancreas
, Where are hormones targeted on cells? - ✅✅They target cells with receptors that are complimentary.
They will not work on other cells
What make the endocrine glands well adapted? - ✅✅- Good blood supply so hormones can easily
enter blood stream
- Hormones only target cells with the right receptors
List the general qualities of hormones. - ✅✅- Small molecules
- Have very specific shapes
- Secreted by endocrine glands
- Transported in blood in low concentrations
- Have widespread, slower affect
- Secreted fast
- Affects target cells
- Short life span in the body
Why is it important that hormones have a short life span in the body? - ✅✅Because otherwise they
would continue their action which would take the factor away from the optimum in the opposite
direction
Understand the main differences between hormones and nervous responses. - ✅✅See booklet page
72
How do the majority of homeostatic control mechanisms work? - ✅✅They use negative feedback
What is negative feedback? - ✅✅A response to a change in the body that counteracts or opposes the
initial change (in either direction)
Describe how negative feedback works. - ✅✅1. Receptor detects stimulus that is out of normal range
or nearing this point
2. A coordination system transfers information between different parts of the body
