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Q 1/174
Score 0
Hair catches particles and prevents them from disrupting or infecting these organs.
30
Hair surrounds/is in the nose, ear, and eyes. Why is that?
Q 2/174
Score 0
rapidly dividing, keratin-filled cells that die and are pushed out of the root.
30
Hair and nails are produced by...
174 questions
Q.
Hair catches particles and prevents them from disrupting or infecting these organs.
1
30 sec
Q.
rapidly dividing, keratin-filled cells that die and are pushed out of the root.
2
30 sec
Q.
Stem cells in the lower epidermis rapidly divide to replace the old skin cells.
3
30 sec
Q.
Sweat is produced on cold days to absorb heat.
4
30 sec
Q.
wear no shirt on sunny days
5
30 sec
Q.
UV-A and UV-B . . . 30
6
30 sec
Q.
epidermis
7
30 sec
Q.
hypodermis
8
30 sec
Q.
dermis
9
30 sec
Q.
melanocyte
10
30 sec
Q.
sebum
11
30 sec
Q.
keratin
12
30 sec
Q.
hair follicle
13
30 sec
Q.
sebaceous gland
14
30 sec
Q.
are connected by gap junctions so that they contract when their neighbors contract.
15
30 sec
Q.
ability to contract
16
30 sec
Q.
Acetylcholine (ACh) activates a muscle fiber, which causes the cell to release Ca^2+ ions from storage. These ions reveal the binding sites for cross-bridges, which pull actin using the energy of ATP.
17
30 sec
Q.
muscle fiber
18
30 sec
Q.
myosin
19
30 sec
Q.
sarcomere
20
30 sec
Q.
cross-bridges binding myosin to actin, and then the cross bridges pull the actin toward the center of the sarcomere with energy from ATP.
21
30 sec
Q.
smooth muscle
22
30 sec
Q.
skeletal muscle
23
30 sec
Q.
cardiac muscle
24
30 sec
Q.
actin
25
30 sec
Q.
acetylcholine
26
30 sec
Q.
tendon
27
30 sec
Q.
myofibril
28
30 sec
Q.
neuromuscular junction
29
30 sec
Q.
red . . . yellow
30
30 sec
Q.
the spine and pelvis
31
30 sec
Q.
the spine
32
30 sec
Q.
Osteoclasts work faster than osteoblasts, so the bone is weakened.
