NAS2 Challenge Exam Questions and
Answers (With Correct Solutions) Latest
2026
anatomy - ANSWER-branch of science concerned with bodily structure of living
organisms; structure
physiology - ANSWER-science dealing with the functions of living things or their organs
level of organization - ANSWER-living things arranged from the simplest to most
complex are:
organelle
cells
tissues
organs
organ systems, organism
populations communities
ecosystem
biosphere
requirements for life - ANSWER-Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimuli
Growth and development
Adaptation through evolution
survival needs - ANSWER-Food, oxygen, water, body temperature, atmospheric
pressure (oxygen/carbon dioxide exchange)
homeostasis - ANSWER-relatively constant internal physical and chemical conditions
that organisms maintain
receptor - ANSWER-senses environmental stimulus and sends info to control center
control center - ANSWER-hypothalamus
signals effector
effector - ANSWER-responds to stimuli
example: muscle contracting
, negative feedback mechanisms - ANSWER-net effect is that the original output of the
system shuts off the original stimulus or reduces the intensity
homeostasis
negative feedback mechanisms - ANSWER-most common form of homeostasis,
bringing people back to normal functioning
negative feedback mechanisms - ANSWER-example of homeostasis: adjustments of
blood pressure, metabolism, body temp
positive feedback mechanisms - ANSWER-form of homeostasis
level of variable changes in same direction as initial change
enhances or accelerates output created by activated stimulus
positive feedback mechanisms - ANSWER-example of type of homeostasis: platelet
aggregation or accumulation in response to injury, child birth
anatomical position - ANSWER-erect position, face forward, arms at side, palms face
forward
used to describe relation to other things
coronal, sagittal, transverse - ANSWER-3 major planes of dissection
cranial - ANSWER-brain body region
spinal/vertebral - ANSWER-spinal cord body region
thoracic cavity - ANSWER-lungs, heart, esophagus, trachea, thymus
abdominal cavity - ANSWER-stomach, liver, spleen, gallbladder, small/large intestines,
kidneys
pleural cavity - ANSWER-contains lungs
pelvic cavity - ANSWER-end of large intestines, urinary bladder, reproductive organs
mediastinum - ANSWER-seperates lungs
pericardial - ANSWER-contains heart
axial - ANSWER-head, neck, and trunk of body
appendicular - ANSWER-limbs
electron - ANSWER-negatively charged particle, outer shell
Answers (With Correct Solutions) Latest
2026
anatomy - ANSWER-branch of science concerned with bodily structure of living
organisms; structure
physiology - ANSWER-science dealing with the functions of living things or their organs
level of organization - ANSWER-living things arranged from the simplest to most
complex are:
organelle
cells
tissues
organs
organ systems, organism
populations communities
ecosystem
biosphere
requirements for life - ANSWER-Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimuli
Growth and development
Adaptation through evolution
survival needs - ANSWER-Food, oxygen, water, body temperature, atmospheric
pressure (oxygen/carbon dioxide exchange)
homeostasis - ANSWER-relatively constant internal physical and chemical conditions
that organisms maintain
receptor - ANSWER-senses environmental stimulus and sends info to control center
control center - ANSWER-hypothalamus
signals effector
effector - ANSWER-responds to stimuli
example: muscle contracting
, negative feedback mechanisms - ANSWER-net effect is that the original output of the
system shuts off the original stimulus or reduces the intensity
homeostasis
negative feedback mechanisms - ANSWER-most common form of homeostasis,
bringing people back to normal functioning
negative feedback mechanisms - ANSWER-example of homeostasis: adjustments of
blood pressure, metabolism, body temp
positive feedback mechanisms - ANSWER-form of homeostasis
level of variable changes in same direction as initial change
enhances or accelerates output created by activated stimulus
positive feedback mechanisms - ANSWER-example of type of homeostasis: platelet
aggregation or accumulation in response to injury, child birth
anatomical position - ANSWER-erect position, face forward, arms at side, palms face
forward
used to describe relation to other things
coronal, sagittal, transverse - ANSWER-3 major planes of dissection
cranial - ANSWER-brain body region
spinal/vertebral - ANSWER-spinal cord body region
thoracic cavity - ANSWER-lungs, heart, esophagus, trachea, thymus
abdominal cavity - ANSWER-stomach, liver, spleen, gallbladder, small/large intestines,
kidneys
pleural cavity - ANSWER-contains lungs
pelvic cavity - ANSWER-end of large intestines, urinary bladder, reproductive organs
mediastinum - ANSWER-seperates lungs
pericardial - ANSWER-contains heart
axial - ANSWER-head, neck, and trunk of body
appendicular - ANSWER-limbs
electron - ANSWER-negatively charged particle, outer shell
