Ruffini endings have numerous fine branches from a single axon within the fluid-filled space of a single thin capsule. Collagen or reticular fibres may not be visible at all or form a loose network between the cells.
Note that there is also lots of glycogen in the region between the two myofibrils in this picture, a storage form for glucose which is metabolized to provide energy for muscle contraction. So, basically, sebaceous glands are small masses of epidermal cells in which sebum a mixture of lipids accumulates rather than keratin.
See Article History Connective tissue, group of tissues in the body that maintain the form of the body and its organs and provide cohesion and internal support.
Less obviously, tiny hair vellus hair occurs even on seemingly hairless regions like eyelids. Large molecules are excluded from the domains and have to find their way through the spaces between domains. Nerve fibres have the capacity to form new branches, i.
The individual bones of the skeleton are held firmly together by ligamentsand muscles are attached to bone by tendons, both of which are examples of dense connective tissue in which many fibre bundles are associated in parallel array to provide great tensile strength.
Learn More in these related Britannica articles: Origin of smooth muscle Smooth muscle cells arise from undifferentiated mesenchymal cells. Lamina propria contains most of the elements of ordinary connective tissue. Nails Please consult an in-depth text e.
Not all tissues give rise to pain; furthermore, each tissue must be stimulated in an appropriate way to invoke its particular sensation of pain. In humans, these tissues include the alimentary or digestive tract, kidneys, liver, and lungs.
Myofibrils may be visible as very fine dots in some of the transversely muscle fibres. ATP-dependent calcium pumps in the membrane of the sarcoplasmatic reticulum typically restore the concentration of Ca to resting levels within 30 milliseconds after the activation of the muscle fibre.
Brown fat is important for thermoregulation in newborns and hibernating mammals. The average length of a sarcomere is about 2. The mucosal surface of simple-columnar epithelium consists of mucus-secreting cells for protection against self-digestion.
Hemopoietic tissues produce the cellular components of the blood. They are displaced to the periphery of the cells and can sometimes be used to define the outline of individual cells. More information about these cell types can be found on the Blood page.
Only with an increasing tension of the bladder wall, due to exessive filling, the vascular resistance rises.
Oral cavity -- Epithelium is protective stratified squamous, partially keratinized on gums and hard palate and on filiform papillae of tonguenon-keratinized elsewhere. The three kinds of mature tissues are dermal, vascular, and ground tissues.This web site was created for students at Austin Community College who are enrolled in Biology / Human Anatomy.
Lab time is limited, and there is never enough time to become really familiar with all of the histology slides. The only tissues which perhaps could be confused with smooth muscle are dense regular connective tissues and peripheral nerves. Both the number of nuclei and their shapes clearly distinguish smooth muscle from dense regular connective tissues.
Histology of the Bladder.
References: (Benninghoff, ).Urothelium: Mucosa of the Bladder. The mucosa of the urinary bladder is lined by a multilayered transitional epithelium (urothelium).The mucosa with a special GAG-layer enables the storage of urine with a high osmotic gradient to the blood.
Tissue: Tissue, in physiology, a level of organization in multicellular organisms; it consists of a group of structurally and functionally similar cells and their intercellular material.
By definition, tissues are absent from unicellular organisms.
Even among the simplest multicellular species, such as. Learning Objectives. Identify the histological landmarks of skeletal muscle; Contrast the structure and function of skeletal, smooth, and cardiac muscle tissue. OVERVIEW of Connective Tissue. Connective tissue forms a framework upon which epithelial tissue rests and within which nerve tissue and muscle tissue are embedded.Download