Tissues are groups of cells that have a common purpose or function in the body. Tissue types include epithelial (outermost), connective, muscle, and neural. Epithelial tissues cover external and internal surfaces and are attached to a basal lamina (basement membrane). Avascular tissues get nutrients from diffusion and osmosis, allowing nutrients from the outside of the body to enter through the digestive system and lungs. There are many types of epithelium tissue, including simple squamous, stratified squamous, and simple columnar. Connective tissue fibers (collagen) are made of protein and are aligned in one direction. Tendons connect muscles to bones while ligaments connect bones to each other. Collagen is also found in skin and bones. Other types of connective tissue include adipose, blood proteins, and muscle.
Glandular epithelial includes merocrine, apocrine, and holocrine glands
Connective tissue, the most abundant tissue in the body, helps connect the organ systems to each other to make the body a cooperative, cohesive unit of trillions of cells
Connective tissue contains fibers such as collagen, elastin, and reticular fibers
Connective tissue cells include fibroblasts, macrophages, mast cells, lymphocytes, adipocytes, and melanocytes
Connective tissue examples (combinations of fibers and cells) include muscle tissue, tendons/ligaments, blood, cartilage, bone and muscle
Did you know…
Q: If holocrine glands are releasing whole cells into the gland, is there a chance that the gland would run out of cells faster than a merocrine gland?
A: No, they wouldn’t since the rate of mitosis would be different. Holocrine glands would require a faster rate of mitosis to replace the cells that have been sloughed off (released), while merocrine glands would be replacing cells less often because they are only letting go of the products within tiny secretory vesicles from the glandular cells.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
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