What type of synovial joint is the elbow?
Hinge joint
Pivot
Ball and socket
Saddle
Correct Answer : A
A hinge joint is a type of synovial joint that allows movement in only one plane, like a door hinge. The elbow joint is made up of the humerus bone in the upper arm, the ulna bone and the radius bone in the forearm. It allows flexion and extension movements, like the opening and closing of a hinge.
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Correct Answer is D
Explanation
Cells of similar structure and function are grouped together to form a tissue. Tissues can be found in many different types of organisms, including animals and plants. There are four main types of tissues in animals: epithelial tissue, connective tissue, muscle tissue, and nervous tissue. Each type of tissue has a specific function and is composed of specialized cells that work together to perform that function.
An organ is a structure made up of two or more tissues that work together to perform a specific function. A system is a group of organs that work together to perform a specific function. A membrane is a thin layer of tissue that covers a surface or divides a space or organ.
Correct Answer is A
Explanation
DNA is a double-stranded macromolecule made up of nucleotides that carry genetic information. The sequence of nucleotides in DNA determines the genetic code, which controls the development and function of living organisms. Chromosomes are structures made up of DNA and proteins that carry genes. Nucleotides are the building blocks of DNA and RNA. RNA, on the other hand, is a single-stranded macromolecule that plays a key role in protein synthesis by carrying genetic information from DNA to ribosomes.
Correct Answer is C
Explanation
The bones that articulate with the carpals are the distal end of the radius and the distal end of the ulna. These two bones form the wrist joint with the carpals. Therefore, if you break the distal end of both the ulna and radius, it will result in a wrist fracture. This type of injury is also known as a distal radius and ulna fracture.
Correct Answer is B
Explanation
Hematoma formation occurs immediately after the bone is fractured. The blood vessels that have been damaged due to the fracture bleed and form a hematoma or a blood clot.
Next, callus formation begins, which involves the accumulation of fibrous tissue, cartilage, and new bone cells around the fracture site, forming a soft callus.
The soft callus then undergoes callus ossification, in which the fibrous tissue and cartilage are gradually replaced by hardened new bone tissue.
Finally, bone remodeling occurs, which involves the reshaping of the newly formed bone tissue to match the shape of the original bone, and the removal of any excess bone material.
Therefore, option b, hematoma formation, Callus formation, Callus ossification, Bone remodeling, is the correct sequence of repair as a fractured bone goes through the healing process.
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