1) sexual reproduction entails the union of two gonads to form a zygote.
2) an individual scientific fact has more information than a theory.
3) hormones serve as intracellular messengers.
4) if the sa node is damaged, nodal rhythm is sufficient to sustain life.
5) norepinephrine stimulates cravings for carbohydrates, whereas endorphins stimulate
cravings for proteins.
6) taste signals travel from the tongue through the facial and glossopharyngeal nerves.
7) a radiograph (x-ray) of a child’s hand will show epiphyseal lines.
8) living keratinocytes exfoliate from the epidermis as tiny specks called dander.
9) thyroid hormone has a calorigenic effect.
10) what are the first-order neurons in the visual pathway?
a. optic nerve fibers
b. rods and cones
c. ganglion cells
d. bipolar cells
e. amacrine cells
11) __________ burns involve the epidermis, all of the dermis, and often some deeper
tissue.
a. first-degree
b. second-degree
c. third-degree
d. partial-thickness
e. malignant
12) accumulation of ca2+ in the synaptic knob is called __________, and probably plays
an important role in __________.
a. synaptic facilitation; short-term memory
b. neural coding; immediate memory
c. postsynaptic potential; long-term memory
d. neural coding; short-term memory
e. long-term potentiation; long-term memory
13) ethnic differences in skin color are primarily caused by differences in
___________.
a. uv radiation exposure
b. the quantity of hemoglobin carried in the blood
c. the quantity of melanin produced
d. the number of melanocytes
e. the number of keratinocytes
14) the continuation of the peritoneum that binds the small intestine and suspends it
from the abdominal wall is called the __________.
a. greater omentum
b. mesentery
c. mesocolon
d. lesser omentum
e. mediastinum
15) myocardial infarction can lead to what type of shock?
a. neurogenic
b. cardiogenic
c. obstructed venous return
d. venous pooling (vascular)
e. hypovolemic
16) the alleles possessed by all members of a population collectively are called the
__________.
a. species dna
b. population dna
c. gene pool
d. genetic drift
e. phenotype
17) during implantation, the trophoblast divides into a deep layer calledthe _________,
which is composed of individual cells.
a. chorion
b. amnion
c. syncytiotrophoblast
d. cytotrophoblast
e. embryoblast
18) thyrotropin-releasing hormone targets the __________.
a. thyroid gland
b. thyroid hormone
c. hypothalamus
d. posterior pituitary
e. anterior pituitary
19) a neuron receives a stimulus. which of the following events happens next?
a. a local potential develops
b. threshold is reached
c. hyperpolarization of the membrane
d. repolarization of the membrane
e. a resting membrane potential is established
20) which of the following are associated with the sense of touch?
a. fibroblasts
b. melanocytes
c. keratinocytes
d. dendritic (langerhans) cells
e. tactile (merkel) cells
21) a mutation is __________.
a. a change in size or shape of a cell
b. a beneficial change in dna structure
c. a harmful change in dna structure
d. a neutral change in dna structure
e. a change in dna structure that might be beneficial, harmful, or neutral
22) which of the following is the correct sequence of events in the healing of a bone
fracture?
a. bone remodeling -> soft callus formation -> hard callus formation -> hematoma
formation
b. bone remodeling -> hard callus formation -> soft callus formation -> hematoma
formation
c. hematoma formation -> soft callus formation -> hard callus formation -> bone
remodeling
d. hematoma formation -> hard callus formation -> soft callus formation -> bone
remodeling
e. soft callus formation -> hard callus formation -> hematoma formation -> bone
remodeling