C) a group of muscle fibers that are all part of the same motor unit. D) a group of muscle fibers and motor neurons. E) a collection of myofibrils in a muscle fiber. 3) Put the following structures in order from superficial to deep: 1. muscle fiber 2. perimysium 3. myofibril 4. fascicle 5. endomysium 6. epimysium A) 1, 5, 4, 3, 2, 6 B) 6, 2, 5, 4, 1, 3 C) 6, 2, 4, 5, 1, 3 D) 1, 3, 5, 6, 4, 2 E) 2, 3, 1, 4, 6, 5 4) Interactions between actin and myosin filaments of the sarcomere are responsible for A) muscle fatigue. B) the conduction of neural stimulation to the muscle fiber.
The contractile unit consists of myofibrils which encompass repeating units of sarcomeres running end to end giving a striated appearance to the muscle. Each sarcomere is characterized by two z-lines, one M-line, an A-band and an H-zone. Actin and myosin are the principle proteins in the contractile machinery with myosin dominating the A-band. The latter refracts plane polarized light (anisotropy) giving a dark appearance to
! DID YOU KNOW? 1. How do cells of three types of Muscle tissues differ from one another automatically? Skeletal muscle cells are long multinucleate cells with obvious striations.
Excitability: The ability of muscle tissue to receive a stimulus from the nervous system. Contractility: The quality that distinguishes muscle tissue from other types of tissue. 2.) Name the three types of muscle tissue found in the human body and briefly describe the primary function of each. Skeletal muscle: attached to the bones of the skeletal system.
They are controlled by the medulla oblongata, which controls involuntary action all throughout the body (Oracle Think Quest, 1996). Just think what it would be like to be in charge of consciously reminding your heart to beat. This is why the heart is an involuntary muscle. Cardiac muscle tissue consists of cylindrical fibers that have cross striations (Thibodeau & Patton, 2008). They have a single nucleus, which helps determine the type of muscle class it is.
Health & social care level 3 Unit 56 1.1 The anatomy and physiology of the human body explains that muscles are attached to the skeleton. They work like hinges or levers to pull or move particular joints when a muscle contracts, pulling the joint in the direction it is designed to move. Parts of muscles move antagonistically, that is, when one contracts, its opposite member relaxes to allow movement. Muscles can become slack, making movement slower and more difficult. Again, it explains that the human muscles move in command from the brain.
Capsular ligaments are a part of the articular capsule that surrounds synovial joints. They act up as mechanical reinforcements, creating stability when the ligaments join together. Articular cartilage- Articular cartilage is a white smooth tissue that covers the ends of bones in the joints. It enables bones of a joint to easily glide over one another, establishing easy movement. Joints between the bones, knee, elbow, and rib cage are some areas in the body where these cartilages can be found.
The human skeleton Is made up of 206 bones. The functions of the skeleton are to provide support, give our bodies shape, and provide protection to other systems and organs of the body, to provide attachments for muscles, to produce movement Joints A joint is the point where two or more bones meet. There are three main types of joints; Fibrous (immoveable), Cartilagenous (partially moveable) and the Synovial (freely moveable) joint. Fibrous joints Fibrous (synarthrodial): This type of joint is held together by only a ligament. Examples are where the teeth are held to their bony sockets and at both the radioulnar and tibiofibular joints.
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.
1. Bone is a very active tissue. Please explain the pathway of how the bone cells get nutrients and oxygen from the blood vessels using the following terms: Periosteum, endosteum, lacunae, lamellae, canaliculi, perforating canals, osteon, Haversian canal (central canal) and trabeculae. How the bone gets the necessary nutrients and oxygen it needs is through an array of microscopic tubes and chambers. In compact bones, blood vessels pass through the bones periosteum, the membrane surrounding the bone, and the endosteum through perpendicular channels known as the perforating canals.