Quantcast Figure 1-5. Structure of a sperm cell. - Obstetrics Pediatrics

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
(a)  Description/information. Compared to a female ovum, a sperm cell
is very small, but it is well shaped to reach out and penetrate a female ovum. A sperm
cell has a head, a middle section, and a tail (figure 1-5). The head is flat and oval
shaped (ideal for penetration and attachment) and contains the nucleus of the cell. The
middle section is made up of substances that make useable energy to propel the tail.
And the long tail acts like a whip to move the sperm. When the head penetrates the
ovum, the tail separates from the rest of the sperm.
Figure 1-5. Structure of a sperm cell.
(b)  Chromosomes in a sperm cell. The nucleus in the head of a sperm
cell contains chromosomes. A mature sperm has 23 chromosomes. An immature
sperm cell has 46 chromosomes, one an X (female) chromosome and the other a Y
(male) chromosome. A reduction division takes place to form a mature cell which has
23 chromosomes. At that time, an X chromosome (female) goes to one sperm cell, and
a Y (male) chromosome goes to the other sperm cell. If an ovum is joined by a sperm
with an X chromosome, the combination will form a female. If a sperm with a Y
chromosome joins an ovum, a male is formed.
MD0584
1-10



Medical News
Autistic features linked to prenatal exposure to fire retardants, phthalates
Exposure during pregnancy to a combination of fire retardant chemicals...
medicalxpress.com
Exposure to endocrine disruptors during pregnancy affects the brain two generations later
Prenatal exposure to low doses of the environmental contaminants polychlorinated...
medicalxpress.com
Are your cells stressed out? One Stanford researcher is helping them relax
Welcome to Biomed Bites, a weekly feature that introduces readers...
scopeblog.stanford.edu
Maker of device in 'superbug' outbreak lacked FDA clearance
The manufacturer of a medical instrument at the center of...
medicalxpress.com
Mutation in APC2 gene causes Sotos features
Sotos syndrome is a congenital syndrome that is characterized by...
medicalxpress.com
Abnormal brain rhythms tied to problems with thinking in schizophrenia
By studying specially bred mice with specific developmental and cognitive...
medicalxpress.com
If you come from a family with relatives who have lived long lives, you will too?
Recent research from the Long Life Family Study (LLFS) confirms...
medicalxpress.com
Drug to control appetite could also fight anxiety
Did you know that our body produces its own marijuana-like...
medicalxpress.com
Molecule from trees helps female mice only resist weight gain
A molecule found in some plants can combat weight gain...
medicalxpress.com
Researchers discover protein's pivotal role in heart failure
Researchers at the University of California, San Diego School of...
medicalxpress.com
From chick to bedside: Removing the Wnt barrier
Kick starting a process that might repair the damage done...
medicalxpress.com
In vivo CRISPR-Cas9 screen sheds light on cancer metastasis and tumor evolution
For the first time, CRISPR-Cas9 gene-editing technology has been employed...
medicalxpress.com
Estimated costs of endocrine-disrupting chemical exposure exceed $209 billion annually
A new economic analysis found exposure to endocrine-disrupting chemicals likely...
medicalxpress.com
Phthalates potentially alter levels of a pregnancy hormone that influences sex development
Exposure to hormone-altering chemicals called phthalates - which are found...
medicalxpress.com
The EdibleRx: Why Does Olive Oil Get All the Love?
(MedPage Today) -- Polyunsaturated oils like sesame and corn may...
medpagetoday.com
Botox to improve smiles in children with facial paralysis
Injecting botulinum toxin A (known commercially as Botox) appears to...
medicalxpress.com
Trends of 21-gene recurrence score assay use in older patients with breast cancer
A genetic test for patients with breast cancer that helps...
medicalxpress.com
Effect of follow-up of MGUS on survival in patients with multiple myeloma
Patients with multiple myeloma (MM) appear to have better survival...
medicalxpress.com
Researchers examine effect of experimental Ebola vaccine after high-risk exposure
A physician who received an experimental Ebola vaccine after experiencing...
medicalxpress.com
Semi-veggie diet effectively lowers heart disease, stroke risk
A pro-vegetarian diet - one that has a higher proportion...
medicalxpress.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +