3) In the human brain, an estimated average rate of 250,000 nerve cells are produced each minute during gestation and through 6 months after birth. a) How many nerve cells are in a healthy 6-month-old human brain? ii) 1.62 x 10¹¹ nerve cells i) 1.62 x 10³ nerve cells iii) 1.62 x 10¹4 nerve cells egg is 4) One of the earliest stages of fertilization that can be measured in a sea urchin Thig nogurc in 2 seconds Egg and sperm
3) In the human brain, an estimated average rate of 250,000 nerve cells are produced each minute during gestation and through 6 months after birth. a) How many nerve cells are in a healthy 6-month-old human brain? ii) 1.62 x 10¹¹ nerve cells i) 1.62 x 10³ nerve cells iii) 1.62 x 10¹4 nerve cells egg is 4) One of the earliest stages of fertilization that can be measured in a sea urchin Thig nogurc in 2 seconds Egg and sperm
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:3) In the human brain, an estimated average rate of 250,000 nerve cells are produced each
minute during gestation and through 6 months after birth.
a) How many nerve cells are in a healthy 6-month-old human brain?
i) 1.62 x 10³ nerve cells ii) 1.62 x 10¹¹ nerve cells iii) 1.62 x 10¹4 nerve cells
egg is
4) One of the earliest stages of fertilization that can be measured in a sea urchin
depolarization of the membrane around the egg. This occurs in 2 seconds. Egg and sperm
nuclei fuse at around 1200 seconds and the first division of the zygote is at 5500 seconds.
a) How many times longer does the process of nuclear fusion take than membrane
depolarization?
i) 2 times
ii) 100 times
iii) 600 times
iv) 1200 times
b) What is the maximum amount of time needed to synthesize a complete set of
chromosomes in the sea urchin zygote prior to its first division?
i) 2 seconds
seconds
ii) 1198 seconds iii) 1200 seconds iv) 4300 seconds v) 5500
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