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Home Q & A Board Biology-Related Homework Help General Biology
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jjlo77 jjlo77
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12 years ago
please help!!!

pp. 170. number 13.  through  25
 or
14. Ia a bald man really hairless?  Explain.

17. Describe the process of hair formation, and list several factors that many influence(a) growth cycles and (b) hair texture.

21. the historical count dracula may have suffered from which of the following (a) porphyria, (b) EB (c) halitosis, (d) vitiligo. Explain.

24. On  an outline diagram of the human body, mark off various regions according to the rule of nines.  What percentage of the total body surface is affected if the skin over the following body parts is lower limb. (c) the entire front of the left upper limb.

25. A common belief is that having your hair cut makes it become thicker.  Explain why this belief is not true.
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wrote...
#1
Staff Member
12 years ago
Quote from: jjlo77 (12 years ago)
14. Ia a bald man really hairless?  Explain.

Generally not. Most “bald” men have fine vellus hairs that look like peach fuzz in the “bald” areas.
- Master of Science in Biology
- Bachelor of Science
wrote...
#2
Staff Member
12 years ago
Quote from: jjlo77 (12 years ago)
17. Describe the process of hair formation, and list several factors that many influence(a) growth cycles and (b) hair texture.

Hair formation begins with an active growth phase, followed by a resting phase. After the resting phase a new hair forms to replace the old one. Factors that affect growth cycles include nutrition, hormones, local dermal blood flow, body region, gender, age, genetic factors, physical or emotional trauma, excessive radiation, and certain drugs. Factors that affect hair texture include hormones, body region, genetic factors, and age.
- Master of Science in Biology
- Bachelor of Science
wrote...
#3
Staff Member
12 years ago
Quote from: jjlo77 (12 years ago)
21. the historical count dracula may have suffered from which of the following (a) porphyria, (b) EB (c) halitosis, (d) vitiligo. Explain.

(a) Porphyria. Porphyria victims lack the ability to form the heme of Hb. Buildup of intermediate by-products ( porphyrins) in the blood cause lesions in sun-exposed skin. Dracula was said to have drunk blood and to have shunned the daylight.
BdDaBomb,  bio_man
- Master of Science in Biology
- Bachelor of Science
wrote...
#4
Staff Member
12 years ago
Quote from: jjlo77 (12 years ago)
24. On  an outline diagram of the human body, mark off various regions according to the rule of nines.  What percentage of the total body surface is affected if the skin over the following body parts is lower limb. (c) the entire front of the left upper limb.

(a) 18% posterior trunk + 4.5% (Right buttock*) + 4.5% (Left buttock) = 27%. *buttock is approximate only (b) Entire lower limb = 36% (c) Entire front (anterior) left upper limb = 4.5%
- Master of Science in Biology
- Bachelor of Science
wrote...
#5
Staff Member
12 years ago
Quote from: jjlo77 (12 years ago)
25. A common belief is that having your hair cut makes it become thicker.  Explain why this belief is not true.

Hair is composed of dead keratinized cells. The growth occurs at the hair follicle and is influenced by nutrition and hormones. Cutting the dead hair does not influence the growth at the follicle.
- Master of Science in Biology
- Bachelor of Science
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