Tissue Level of Organization- Nervous Tissue & Membranes

Nervous tissue is composed of only 2 principal kinds of cells;

neurons (nerve cells) and neuroglia (protective and supporting cells)

Most neurons consists of a cell body and two types of processes called...?

dendrites (input toward body), and axons (output away from body)

Neurons are sensitive to...?

stimuli, they convert stimuli into nerve impulses and conduct nerve impulses to other neurons, muscle fibers or glands

Membranes

flat sheets of pliable tissue that cover or line part of the body,

Epithelial Membranes

consist of an epithelial layer and an underlying connective tissue layer, there are four different types...

Mucous Membranes (mucosae)

line cavities that open to the exterior, GI tract, respiratory, urinary, reproductive, acts as barrier to pathogens and trapping surface for particles, type may vary depending on location

Serous Membranes (serosa)

lines a body cavitiy that does not open directly to the exterior and covers the organs that like within the cavity, i.e, pleura (lungs), pericardium (heart), peritoneum (abdominal wall),

Serous membrane consist of ?? and ?? portions

parietal (wall) and visceral (organ)

serous membrane layers secret a ??

lubricating serous fluid that reduces friction between organs and the walls of the cavities in which they are located

Cutaneous membrane

skin, different from the others because it is dry, waterproof, and relatively thick

Cutaneous membranes include...

stratified squamous epithelium, areolar tissue, underlying dense connective tissue

Synovial Membranes

line joint cavities, bursae, and tendon sheaths, contain ONLY connective tissue, collagen, elastic and reticular connective tissue, secret a lubricating synovial fluid

Synovial membranes provide...?

lubrication and nutrients for hyaline cartilage