! 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.
these are bound together by connective tissue. - each muscle fibre is a single muscle cell surrounded by a cell surface membrane. - Inside the muscle fibre is the cytoplasm containing mitochondria and the other organelles found in a cell. - Within each muscle fibre there are also numerous myofibrils, each is composed of repeated contractile units called sarcomeres. - when the muscle contracts the dark band overlaps the intermediate band shortening the length of the muscle
It is not attached to the skeleton. Cardiac muscle – this is only found in the heart and the junction where the major vessels enter or leave the heart. This muscle appears to have similar properties to both skeletal and smooth muscle in that it contains fibres which are striped but unlike striped muscle there are branches which interconnect also known as intercalculated discs. As we need to keep alive, cardiac muscle is an involuntary muscle. Nervous tissue – this is only found in the nervous system and consists of two different tls which transmit nerve impulses throughout the body
| Muscular System | |The Muscles: Each muscle is an organ, comprised of skeletal __muscle__ tissue, several ___connective____ tissue coverings, __nervous_ tissue to cause it | |to contract, and __blood___ to nourish it. | | Connective Tissue coverings: | |The muscle has several dense connective coverings.
This fiber type relies on aerobic metabolism. They split ATP at a slow rate and have a slow contraction velocity. These fibers have a high capacity to generate ATP by oxidative metabolic processes. Very resistant to fatigue (usually find an abundance of these type of fibers in runners) Aerobic Metabolism The metabolic process that occurs in the cells, by which the body uses oxygen to produce energy. Type II A Fibres These fibres, also called fast twitch or fast oxidative fibers, contain very large amounts of myoglobin, very many mitochondria and very many blood capillaries.
| |[pic] |For movement we require skeletal muscles to contract for force and power production. | | |The intensity and duration of the exercise will determine the type of muscle fibres recruited and | | |the force and frequency of the contraction. | | |Type I muscle fibre: Slow twitch. | | |Type II muscle fibre: Fast twitch. | | |Average person has equal amounts of Type I and Type II.
Essay shows the importance of bones in human body and their main role, tasks they accomplish every day. Skeletal function Six functions of the skeleton: Support: Provides structural support for the entire body Protection: Surrounds soft tissue- ex. ribs and sternum protect the heart and lungs, - skull protects the brain Movement: Skeletal muscle is attached to bone so it pulls on the bone when it contracts Mineral homeostasis: Stores calcium and phosphorus--minerals are released into the blood when needed Blood cell production: Red bone marrow produces red blood cells, white blood cells and other blood elements. Storage: Storage of minerals and lipids (fats)-yellow marrow stores fat-(found in long bones) Bone. Definition: Bones are rigid organs that constitute part of the endoskeleton of vertebrates.
Deep Fascia connective tissue with dense irregular tissue that lines the body wall and limbs. Muscle Cell muscle fibers that are elongated and striated and multinucleated. A skeletal muscle fiber is actually embryonic cells that have fused together to form one large cell with multiple nuclei. Perimysium dense
Explain the physiology of two named body systems in relation to energy metabolism in the body In this assignment i am going to be describing the roles of energy in the body, with examples and then will be describing the physiology of the cardiovascular, respiratory and digestive systems in relation to providing the materials for energy metabolism to the cells. The role of energy ATP is the only type of energy the human body can use, although the body stores energy such as fat, glycogen, creatinine phosphate but they will be turned into ATP before the body can use it. There are also chemical, light, heats, sound and nuclear and these are all types of energy. We need energy to grow which builds new tissues, to repair our bodies, muscles need energy for movement; we need energy to help break food down, to send nerve impulses and to stay warm. How is energy produced?
Name_science___________________________________Block_____Date__________________ Ch 6 The Muscular System Notes Lisa Peck Muscular System: consists of skeletal muscles and their connective tissue attachments organ- skeletal muscle consists of hundreds of muscle fibers (cells) bound tog. by connective tissue cell- muscle fibers- elongated cells largest (compared to smooth muscle) primary function is contraction: ability to shorten dep. on myofilaments muscle prefixes “myo” - muscle “mys” - muscle “sarco” - flesh 3 Muscle Types (p 178-181) 1. Skeletal Muscle- skeletal, striated, & voluntary referred to as the human body’s “muscular system” location: attach to bones or indirectly to other connective tissues or cartilage attach via tendons or aponeuroses exception: some facial muscles attach to soft tissues (oth. muscles or skin) function: create movement of bones or facial skin via contractions contraction 1. regulation: voluntary subject to conscious control via nervous system only muscle type that is voluntary 2. speed: rapidly w/ great force tire easily must rest after activity 3. no rhythmic contractions morphology: single cell elongated cylindrical shape myofiber (cell): sarcolemma- muscle cell membrane myofibrils- contractile organelles found in cytoplasm of muscle cells long tube-like have light and dark bands along length many aligned perfectly w/ in sarcolemma giving a striated appearance to cell multinucleated- nuclei and cytoplasm pushed to edge of sarcolemma by numerous myofibrils sarcoplasmic reticulum- ER of cell stores calcium (for contraction) striated- banded appearance due to alignment of bands on myofibrils myofibril bands created by arrangement of myofilaments within myofibril myofilaments- filaments composing the myofibrils two types: actin & myosin Skeletal Muscle connective tissue coverings of skeletal muscle endomysium- thin connective