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Mnenie [13.5K]
3 years ago
5

The normal number of spermatozoa per milliliter of semen in a male adult is approximately:

Medicine
1 answer:
Oxana [17]3 years ago
4 0

Answer:

The correct answer is d. 20,000,000 to 150,000,000

Explanation:

The normal number of spermatozoa per milliliter of semen in male adult is between 20 million to 300 million. If the sperm count is below 10 million per ml then the sperm count is considered to be low.

If the sperm count ranges between 20 million to 40 million per ml then it is considered as average sperm count. In this case doctors usually check the motility, size and shape of spermatozoa and if the motility is high then it is considered to be normal sperm count.

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One year, heavy rain makes Lake Raymond very deep. The next year, however, rain is very light, and not much water is left in Lak
laila [671]

Answer:

There will be less animal life in lake Raymond in the next year.

Explanation:

In the year with heavy rain, this has caused the depth of Raymond lake to be increased. This will bring an increase in the growth and survival of more water plants and animal species.

In the second year where there is a decrease in the water level, the animals and water plants will face problems. The worst hit are those plants and animals species that lives at a much deeper path of the lake with the least sunlight or any external factors that are now going to be more exposed due to low water level..

3 0
3 years ago
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What is a waste product usually excreted by the kidney?
Evgesh-ka [11]

Answer:

the kidneys separate waste material from metabolism like urea, uric acid, and creatinine.

Explanation:

The kidneys are blood filtering equipment. By generating and discharging urine, the kidneys separate waste material from metabolism like urea, uric acid, and creatinine. In addition, urine may contain sulfate and phenol waste and surplus ions of sodium, potassium and chloride. The kidneys assist to keep homeostasis by controlling body fluid concentration and quantity

8 0
3 years ago
How could you explore the origin of the different types of blindness?
igor_vitrenko [27]

Answer:

Common causes of blindness are diabetic neuropathy, glaucoma and cataracts.

Explanation:

Blindness refers to the complete lack of functional vision.It occurs when an inadequate amount of light hits the retina, or the information has not been delivered to the brain correctly.

Complete blindness : characterized by a complete and total loss of vision. Merck Manuals reports that legal blindness is defined as having equal to or worse than a 20/200 visual acuity in the better eye. Having a visual acuity of 20/200 means that someone with normal vision can see an object at 200 feet, and a person with impaired vision can see at a distance no further than 20 feet. Several different diseases can cause complete blindness; some develop later in life and some are present at birth. The leading cause of blindness in the United States is diabetes, according to the National Eye Institute. Diabetes causes diabetic retinopathy, which results in destruction of the retina. Other causes of complete blindness include age-related macular degeneration, which the National Eye Institute calls the most common cause of blindness in adults who are 60 or older; cataracts, which obstructs light from hitting the retina because of opaque patches on a lens; and glaucoma, which causes blindness due to damage to the optic nerve.

Color Blindness :

People who have color blindness, also called dyschromatopsia, are unable to distinguish certain colors. This type of blindness more commonly affects men than women. Merck Manuals reports that the most common form of color blindness is red-green color blindness, which makes it difficult to distinguish certain shades of red and green. Color blindness is almost always present at birth, and is usually caused by the presence of a defective gene on the X chromosome. The reason that more men are affected by color blindness than women is that women have two X chromosomes; thus, even if they are "carriers" of a bad gene, their other X chromosome usually has a functional gene. Because men have only one X chromosome, the presence of one bad gene is sufficient to cause color blindness. Defective retinal cells result in some forms of color blindness; other forms are caused by defects in the optic nerve.

Night Blindness :

Night blindness is vision impairment that occurs at night or when light is dim. It does not generally result in a complete lack of vision but significantly impaired vision. People with night blindness often have difficulty driving at night or seeing stars. Several different factors cause night blindness, according to the University of Maryland Medical Center. These factors include cataracts, birth defects, a vitamin A deficiency, or a retinal disease called retinitis pigmentosa

5 0
3 years ago
How does an antibiotic act as a selective agent in promoting bacterial resistance?
Deffense [45]

Answer: In the case of antibiotic resistance, antibiotics cause a selective pressure by killing susceptible bacteria, allowing antibiotic-resistant bacteria to survive and multiply. Selection pressure can be regarded as a force that causes a particular organism to evolve in a certain direction.

Explanation:

4 0
3 years ago
A sagittal lesion in the optic chiasma will result in loss of ________.
ioda
Anwser : Lateral vision in the right eye
4 0
3 years ago
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