Test 1

Question 1

criteria of life

Answer 1

maintaining boundaries, movement, reproduction, growth, responsiveness/irritability, excretion, metabolism, digestion

Question 2

necessities to sustain life

Answer 2

oxygen, normal body temperature, atmospheric pressure, water, nutrients

Question 3

example and explanation of homeostasis

Answer 3

not enough oxygen going through the body, then heart is stimulated to pump harder and do more work

Question 4

3 parts of feedback system

Answer 4

receptor, control center, effector

Question 5

afferent

Answer 5

receptor to control center

Question 6

efferent

Answer 6

control center to effector

Question 7

negative feedback and examples

Answer 7

reverses the effects of the stimulus, ex: cold room and blood sugar

Question 8

negative feedback-blood sugar

Answer 8

stimulus:big meal
increased blood sugar
receptors in brain
pancreas releases insulin (islets of langeruans) endocrine cells

Question 9

negative feedback: cold room

Answer 9

stimulus: cold room
temperature receptors
brain analyzes
effect= shivering (involuntary skeletal muscle contractions), goosebumps (involuntary contraction of smooth muscles)

Question 10

positive feedback and example

Answer 10

enhances effect of original stimulus, hemostasis (blood clotting)

Question 11

positive feedback: blood clotting (hemostasis)

Answer 11

stimulus=cut finger/bleeding and vasoconstriction (forming of platelet plug)
effect: clotting
platelets release chemicals
effect: vasoconstriction and more platelets to site of injury, activation of clotting factors