1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
torisob [31]
3 years ago
12

Which of the following was originally used to measure bone density?

Biology
1 answer:
Alexus [3.1K]3 years ago
3 0

X-rays used to measure bone density.

<u>Explanation</u>:      

The bones density test measured by the X-rays, it measures the content of calcium and other bone minerals that are packed into the segment of bone. Most commonly used parts of bone for testing are spine, hip, occasionally and the forearm. It is generally done to know the chances of osteoporosis. More the bone minerals, more will be density.  More density means the higher bone strength. Before the test, a person should avoid having calcium supplement.

You might be interested in
I need to know 5 and 6
marissa [1.9K]

Answer:

5 is c 6 is a I think

Explanation:

i just use go og le

7 0
2 years ago
If two tabby cats are crossed with each other, what is the likelihood that they’ll have a tabby kitten? a black kitten?
scoray [572]

Answer:

100% Tabby Cat.

For Kitten depends on the color.

Explanation:

Did the teacher give you the color of the tabby cats? This question can't be answered unless the colors of the cats are provided!

5 0
3 years ago
Animal cells have which of the following characteristics? Select all that apply.
devlian [24]

Answer:

Animal Cell Structure

Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall. This feature was lost in the distant past by the single-celled organisms that gave rise to the kingdom Animalia. Most cells, both animal and plant, range in size between 1 and 100 micrometers and are thus visible only with the aid of a microscope.

Anatomy of the Animal Cell

The lack of a rigid cell wall allowed animals to develop a greater diversity of cell types, tissues, and organs. Specialized cells that formed nerves and muscles—tissues impossible for plants to evolve—gave these organisms mobility. The ability to move about by the use of specialized muscle tissues is a hallmark of the animal world, though a few animals, primarily sponges, do not possess differentiated tissues. Notably, protozoans locomote, but it is only via nonmuscular means, in effect, using cilia, flagella, and pseudopodia.

The animal kingdom is unique among eukaryotic organisms because most animal tissues are bound together in an extracellular matrix by a triple helix of protein known as collagen. Plant and fungal cells are bound together in tissues or aggregations by other molecules, such as pectin. The fact that no other organisms utilize collagen in this manner is one of the indications that all animals arose from a common unicellular ancestor. Bones, shells, spicules, and other hardened structures are formed when the collagen-containing extracellular matrix between animal cells becomes calcified.

Animals are a large and incredibly diverse group of organisms. Making up about three-quarters of the species on Earth, they run the gamut from corals and jellyfish to ants, whales, elephants, and, of course, humans. Being mobile has given animals, which are capable of sensing and responding to their environment, the flexibility to adopt many different modes of feeding, defense, and reproduction. Unlike plants, however, animals are unable to manufacture their own food, and therefore, are always directly or indirectly dependent on plant life.

Most animal cells are diploid, meaning that their chromosomes exist in homologous pairs. Different chromosomal ploidies are also, however, known to occasionally occur. The proliferation of animal cells occurs in a variety of ways. In instances of sexual reproduction, the cellular process of meiosis is first necessary so that haploid daughter cells, or gametes, can be produced. Two haploid cells then fuse to form a diploid zygote, which develops into a new organism as its cells divide and multiply.

The earliest fossil evidence of animals dates from the Vendian Period (650 to 544 million years ago), with coelenterate-type creatures that left traces of their soft bodies in shallow-water sediments. The first mass extinction ended that period, but during the Cambrian Period which followed, an explosion of new forms began the evolutionary radiation that produced most of the major groups, or phyla, known today. Vertebrates (animals with backbones) are not known to have occurred until the early Ordovician Period (505 to 438 million years ago).

Fluorescence Microscopy of Cells in Culture

Cells were discovered in 1665 by British scientist Robert Hooke who first observed them in his crude (by today's standards) seventeenth century optical microscope. In fact, Hooke coined the term "cell", in a biological context, when he described the microscopic structure of cork like a tiny, bare room or monk's cell. Illustrated in Figure 2 are a pair of fibroblast deer skin cells that have been labeled with fluorescent probes and photographed in the microscope to reveal their internal structure. The nuclei are stained with a red probe, while the Golgi apparatus and microfilament actin network are stained green and blue, respectively. The microscope has been a fundamental tool in the field of cell biology and is often used to observe living cells in culture. Use the links below to obtain more detailed information about the various components that are found in animal cells.

4 0
3 years ago
This glaucoma treatment may be used to create a new opening for the escape of aqueous humor from the anterior cavity of the eye,
Mazyrski [523]

This glaucoma treatment may be used to create a new opening for the escape of aqueous humor from the anterior cavity of the eye, thus relieving intraocular pressure: trabeculectomy

<h3>What does Glaucoma mean?</h3>

A collection of eye conditions known as glaucoma can result in vision loss and blindness by harming the optic nerve, a nerve located in the back of the eye. You may not notice the symptoms at first because they can appear gradually. Getting a thorough dilated eye exam is the only method to determine if you have glaucoma.

Glaucoma is a lifelong condition and should be referred to as a permanent disorder because it can be managed conservatively.

The procedure of treating glaucoma with surgery is known as trabeculectomy. Trabeculectomy is a filtering surgery where an ostium is created into the anterior chamber from underneath a partial thickness scleral flap to allow for aqueous flow out of the eye.

Learn more about Glaucoma here:

brainly.com/question/1594031

#SPJ4

7 0
1 year ago
Many molecules are moved through the body by .
blondinia [14]
I don't know if this is the answer you're looking for but "Transporters" move molecules across membranes. Such as channel proteins and carrier proteins
6 0
3 years ago
Other questions:
  • What can cause a earthquake
    12·2 answers
  • During transcription, which end of the new rna molecule protrudes from the rna polymerase?
    11·1 answer
  • Even though RSV infection in infants is common, a vaccine does not currently exist. Imagine you are designing a recombinant vacc
    14·1 answer
  • An organism's development from an embryo may contain clues about its history that scientists can use to develop relationships an
    15·1 answer
  • 5 differences between lymph and serum ​
    6·1 answer
  • In observing epithelial cells under a microscope, the cells are arranged in a single layer and look tall and narrow, and the nuc
    13·1 answer
  • Which of the following domains does this statement describe?
    7·1 answer
  • Compare how a greenhouse and Earth's atmosphere trap heat.
    13·1 answer
  • Fill in the blank
    13·2 answers
  • Please help with these questions :)
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!