This type of tissue has gap junctions, a single
nucleus, many mitochondria, is striated and
functions involuntarily. This tissue type is
a. skeletal muscle.
b. smooth muscle.
c. cardiac muscle.
d. striated columnar epithelium.
e. more than one of these
C
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The organ system that protects the underlying tissues from abrasion, prevents dehydration, and aids in regulating body temperature.
A) Muscular
G) Respiratory
B) Reproductive
H) Skeletal
C) Digestive
I) Nervous
D) Cardiovascular
J) Endocrine
E) Integumentary
K) Lymphatic
F) Urinary
The earliest stromatolites were probably formed by
A) anoxygenic phototrophs. B) anoxygenic lithotrophs. C) oxygenic phototrophs. D) oxygenic lithotrophs.
Skeletal muscle can operate anaerobically for short periods, producing ________ and a small amount of ATP
a. lactate b. pyruvate c. creatine d. phosphate
You are studying a mini-ecosystem that you created from samples of lake water, plants, and sediment. Your teacher tells you to drop about 10 sesame seeds on the top of the water because they will attract some interesting organisms. One week later, you
see that the seeds are surrounded by white fuzz that is extending off of the seeds, and you conclude that the decomposing seeds have been colonized by A) diatoms. B) brown algae. C) unikonts. D) water molds.