They have a single nucleus, which helps determine the type of muscle class it is. These fibers are short and branching and are often Y- or V- shaped (Parker, 2007). Their main function is to propel blood into circulation. Contraction of cardiac muscle tissue happens by an impulse sent from the medulla oblongata to the sinatorial node, also known as the heart’s natural pacemaker (Thibodeau & Patton, 2008). Smooth muscle is another one of the muscle types that make up the muscular system.
It forms tendons and ligaments, provides coverings that support and protect muscle and nervous tissue. The hardest connective tissue, bone, protects organs and provides a framework for movement of muscle. Adipose tissue insulates body and stores lipids. Connective tissue is not very cellular. Its extracellular matrix consists of fibers and ground substance that are made and secreted by different connective tissue.
The function of these muscles is closely related to their structure and any differences in structure allow these two types of muscle to be identified. Cardiac and skeletal muscle is excitable tissue where stimulation of a single muscle fibre leads to excitation of a whole cell. They undergo contractions in response to an action potential, either resulting in pumping blood into pulmonary and systemic circulation or the movement of limbs. The contractile unit in both tissues is the same, the differences lie in the arrangement of these units and associate structures. The contractile unit consists of myofibrils which encompass repeating units of sarcomeres running end to end giving a striated appearance to the muscle.
This could be in the form of a liquid, like blood. The matrix is usually secreted by connective tissues. There are connective tissues in blood, cartilage, bone, areolar tissues and adipose tissues. The blood transports materials, areolar gives support to the tissue, and as does cartilage, the bone strengthens and protects. Many different tissues are made of different fibres which are secreted by the cell to provide characteristics.
It also functions as a barrier to potential pathogens and foreign particles, preventing infection and tissue injury by action of the mucociliary escalator. Endothelial Lining of Arteries and Veins in the Cardiovascular System: Endothelial cells form the linings of the blood vessels. Arteries and veins have a thick, tough wall of connective tissue and many layers of smooth muscle cells. The amount of connective tissue and smooth muscle in the vessel wall will vary on the vessels diameter and the vessels function. Endothelial lining is always present.
P2- Outline the structure of the main tissues of the body In this written assay out the structure of the main tissues of the body. The tissues I’m going to speak about is cell membrane, nucleus, cytoplasm; organelles – mitochondria, endoplasmic reticulum (smooth and rough), Golgi apparatus, lysosome. Tissues Tissues are sets of the same cells carrying out particular functions these include; epithelial, connective, muscle and nervous. Epithelial tissues are the inside layer of internal and external surfaces and body cavities, including ducts carrying secretions from glands. They may be composed of some layers of cells, called compound epithelia or just a single layer which is known as simple epithelia.
They are from bottom to top: stratum basale stratum spinosum stratum granulosum stratum licidum stratum corneum Cells in the stratum basale are shaped like columns. As the cells divide they push the cells that have already formed into higher layers, and as they move up the layers they flatten and eventually die. There are also three specialized types of cells these are. The melanocyte This produces pigment (melanin) The Langerhans This cell is the frontline defense of the immune system in the skin The Merkel The function of this is cell s not clearly known Dermis This is the second layer of the skin, and has a thickness between.05 mm (eyelids) and3.0 mm (back). There are three types of tissue that are present throughout - not in layers.
Biol-2401-31726 Quiz #4 Chap. 10 1) Why does skeletal muscle have sacromeres and smooth muscle does not? Give one detailed reason. Skeletal muscle is most commonly attached to our bones and tendons. So in order for this muscle to be able to endure hard and quick contractions to help move our bones, it has to be strong and tightly put together.
Its main function is to connect the central nervous system to the limbs and organs. The PNS is made up of nerves that are cordlike bundles of nerve fiber that transmit the impulses and ganglia that are knot-like masses of nerve cells all situated outside the central nervous system. It’s not protected by the bone of the spine and skull or by the blood-brain barrier. The PNS consists of 12 pairs of cranial nerves and 31 pairs of spinal nerves. It’s broken down into the somatic nervous system and the autonomic nervous system.
These allows free of action potentials between cells that create muscle contraction. striated like skeletal muscle. Ca A. What are some unique structural features of cardiac muscle? In cardiac muscle intercalated discs is a specializes junction between cells.