7.4 QUESTIONS
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How many bones does the adult human body have?
The adult human body has 206 bones.
The skeletal system is made of:
Organs called bones
What are long bones?
Bones of the extremities or arms and legs
what is the long shaft of the bone called?
diaphysis
The two extremities or end of the bones are called what
epiphysis
where is the Medullary canal? What is it filled with?
It is a cavity in the diaphysis, and it is filled with yellow marrow
What is yellow marrow made up of?
Fat cells
what is the endosteum?
membrane that lines the medullary canal and keeps the yellow bone marrow intact.
Where is red bone marrow found?
in certain bones, such as the vertebrae ribs, sternum and cranium, and in the proximal ends of the humerus and femur
Red bone marrow produces what?
Red blood cells and white blood cells
What is erythrocytes?
Red blood cells
what are leukocytes
White blood cells
what is the outside of the bone covered with?
A tough membrane called PERIOSTEUM
what does the periosteum contain?
blood vessels, lymph vessels osteoblast, which are cells that form new bone tissue
Periosteum is necessary for?
Bone growth, repair and nutrition
The skull is composed of what bones
Cranial and facial
when do fontanels turn into solid bone?
approx 18 months
what does vertebrae do?
protect the spinal cord and provide support for head and trunk
what are intervertebral disks?
Pads of Cartlidge tissue
what do intervertebral disks do?
Separate the vertebra act, a shock, absorbers and allow bending and twisting
The first three pairs of false ribs, attach where
To the cartilage of the rib above
The last two pairs of false ribs are called what and why?
floating ribs because they have no attachment to the front of the body
The last five pairs of ribs are called
false ribs
The first seven pairs of ribs are called what and why?
True ribs because they attach directly to your sternum or breast bone on the front of the body