Cells Flashcards
Endocrine glands
Secretion endocrine glands secrete hormones directly into the bloodstream or lymphatic system,which then travel to specific target organs or tissues
Function these hormones regulate various bodily functions,including metabolism,growth,mood,and reproductive system
And they have no ducts and their secretions are internal and spread through the body from bloodstream
Exocrine glands
Secretion:exocrine glands release their secretions through ducts onto an external surface or into body cavities
For digestion (enzymes)
They have ducts to transport their secretions to specific locations
Connective tissue
Connects body parts
It’s found everywhere in the body
It’s is the most abundant tissue types
Performs many functions
But they are primarily involved in protecting,supporting,cushioning and insulating other body tissues
Vascularization(good blood supply) in conective tissue
Except for tendons and ligaments (poor blood supply) and cartilage is avascular (no blood supply)
Tissues with poor or no blood supply heal slowly
Connective tissues consist of
Various types of cells
Extracellular matrix (nonliving substance outside the cells)
Extracellular matrix provides supply support towards the cells
It’s crucial for tissue strength,flexibility and function
And it’s structurless contains a lot of water
All conective tissues have living cells surrounded by Extracellular matrix
Difference:
Specific cell types
Types and amount of fibers in the matrix
Bones(osseous tissue)
Composed of osteocytes(bone cells)
Found in small cavities called lucanae
The lucanae are surrounded by many layers of hard matrix
Contains calcium salt giving it hardness
Contains collagen fibers providing strength and flexibility
Cartilage
Less hard and more flexible than bone
Cell type chondrocytes (cartilage cells)
Dense connective tissue
Main matrix collagen fibers
Fibroclast (fiber-forming cells)
Loose connective tissue
Softer
Have more cells
And fewer fibers
Then any other connective tissue
Main types areolar,adipose,and reticular
Areolar connective tissue
Most widely distributed connective tissue in the body
Soft,pliable and cobwebby in texture
Cushions and protects organs it wraps
Acts as packing tissue and glue
Adipose
Commonly called fat
Insulates the body
Protects the body from bumps
Forms subcutaneous beneath the skin
Reticular connective tissue
Consists of delicate network of interwoven reticular fibers
Blood
Considered a connective tissue because it consists of blood cells surrounded by a nonliving,fluid matrix called blood
Fibers of blood is soluble protein
