Bio 201 Chapter 1 Exam
Put the following levels of organization from the simpler to the more complex level. –
answer 1. Chemical level
2. Cellular level
3. Tissue level
4. Organ level
5. Organ system level
6. Organism level
Which of the following statements regarding positive feedback is not correct? - answer If
blood pressure decreases and negative feedback is not able to maintain homeostasis,
positive feedback will cause blood pressure to increase.
Put the following events in the correct order to describe how negative feedback controls
blood pressure. – answer 1. Receptors in the wall of a blood vessel detect that blood
pressure has decreased.
2. Nerves send information about blood pressure to the control center (the brain).
3. Nerves from the brain send signals to the effector (the heart) to increase stroke rate
and volume.
4. Blood pressure is restored to its normal levels.
Place each statement in the proper category to distinguish whether it is referring to
positive or negative feedback. - answerPositive feedback
1. This feedback produces a rapid "climatic event".
3. This feedback is an increasing, amplifying, or magnifying process.
4. Stretching the cervix indirectly causes the uterus to contract with more force, causing
greater stretch of the cervix.
5. Platelets in the blood adhere to a recent cut in the skin and release chemicals, which
causes additional platelets to adhere to the wound.
Negative feedback
1. This feedback negates (make ineffective) or reverses a trend.
2. Decreasing blood pressure indirectly causes widespread vasoconstriction, resulting in
a rise in blood pressure.
3. Decreasing levels of blood calcium cause parathyroid hormone to be released,
resulting in the increase of blood calcium levels.
Longitudinal section - answerthrough the long axis of an organ
Transverse (cross) section - answerright angle to the long axis
Oblique section - answerthrough the long axis at other than a right angle
Put the following levels of organization from the simpler to the more complex level. –
answer 1. Chemical level
2. Cellular level
3. Tissue level
4. Organ level
5. Organ system level
6. Organism level
Which of the following statements regarding positive feedback is not correct? - answer If
blood pressure decreases and negative feedback is not able to maintain homeostasis,
positive feedback will cause blood pressure to increase.
Put the following events in the correct order to describe how negative feedback controls
blood pressure. – answer 1. Receptors in the wall of a blood vessel detect that blood
pressure has decreased.
2. Nerves send information about blood pressure to the control center (the brain).
3. Nerves from the brain send signals to the effector (the heart) to increase stroke rate
and volume.
4. Blood pressure is restored to its normal levels.
Place each statement in the proper category to distinguish whether it is referring to
positive or negative feedback. - answerPositive feedback
1. This feedback produces a rapid "climatic event".
3. This feedback is an increasing, amplifying, or magnifying process.
4. Stretching the cervix indirectly causes the uterus to contract with more force, causing
greater stretch of the cervix.
5. Platelets in the blood adhere to a recent cut in the skin and release chemicals, which
causes additional platelets to adhere to the wound.
Negative feedback
1. This feedback negates (make ineffective) or reverses a trend.
2. Decreasing blood pressure indirectly causes widespread vasoconstriction, resulting in
a rise in blood pressure.
3. Decreasing levels of blood calcium cause parathyroid hormone to be released,
resulting in the increase of blood calcium levels.
Longitudinal section - answerthrough the long axis of an organ
Transverse (cross) section - answerright angle to the long axis
Oblique section - answerthrough the long axis at other than a right angle
