Human skeleton The skeletal system serves many important functions; it provides the shape and form for the body, support and protection, allows bodily movement, produces blood for the body, and stores minerals.
There are three types of muscle tissue: Visceral, cardiac, and skeletal. Visceral Muscle Visceral muscle is found inside of organs like the stomachintestines, and blood vessels. The weakest of all muscle tissues, visceral muscle makes organs contract to move substances through the organ. Because visceral muscle is controlled by the unconscious part of the brain, it is known as involuntary muscle—it cannot be directly controlled by the conscious mind.
This smooth appearance starkly contrasts with the banded appearance of cardiac and skeletal muscles. Cardiac Muscle Found only in the heartcardiac muscle is responsible for pumping blood throughout the body. Cardiac muscle tissue cannot be controlled consciously, so it is an involuntary muscle.
While hormones and signals from the brain adjust the rate of contraction, cardiac muscle stimulates itself to contract. The natural pacemaker of the heart is made of cardiac muscle tissue that stimulates other cardiac muscle cells to contract.
Because of its self-stimulation, cardiac muscle is considered to be autorhythmic or intrinsically controlled. The cells of cardiac muscle tissue are striated—that is, they appear to have light and dark stripes when viewed under a light microscope.
The arrangement of protein fibers inside of the cells causes these light and dark bands. Striations indicate that a muscle cell is very strong, unlike visceral muscles.
The cells of cardiac muscle are branched X or Y shaped cells tightly connected together by special junctions called intercalated disks. Intercalated disks are made up of fingerlike projections from two neighboring cells that interlock and provide a strong bond between the cells.
The branched structure and intercalated disks allow the muscle cells to resist high blood pressures and the strain of pumping blood throughout a lifetime.
These features also help to spread electrochemical signals quickly from cell to cell so that the heart can beat as a unit. Skeletal Muscle Skeletal muscle is the only voluntary muscle tissue in the human body—it is controlled consciously.
Every physical action that a person consciously performs e. The function of skeletal muscle is to contract to move parts of the body closer to the bone that the muscle is attached to. Most skeletal muscles are attached to two bones across a joint, so the muscle serves to move parts of those bones closer to each other.
Skeletal muscle cells form when many smaller progenitor cells lump themselves together to form long, straight, multinucleated fibers. Striated just like cardiac muscle, these skeletal muscle fibers are very strong.A complete list of muscular system quizzes; covering upper limb, lower limb, head, back, and abdominal muscles through a series of high-quality multiple choice questions that features labeled images and diagrams.
Test yourself for free now! The human musculoskeletal system (also known as the locomotor system, and previously the activity system) is an organ system that gives humans the ability to move using their muscular and skeletal ashio-midori.com musculoskeletal system provides form, support, stability, and movement to the body.
It is made up of the bones of the skeleton, muscles, cartilage, tendons, ligaments, joints, and other. Functions of Muscular System: Muscular system has the following important functions in human body; MOVEMENTS OF BODY PARTS: Skeletal muscles are responsible for all voluntary movements of human body parts.
They provide the force by contracting actively at the expense of energy. Start studying 4 functions of muscular system. Learn vocabulary, terms, and more with flashcards, games, and other study tools. No conversation about the muscular system is compete without looking at fascia.
In this lecture we look at the structure and function of this often unappreciated structure. Structure and Functions of Muscular Tissue. Note: This page is part of the section about the structure and function of different Tissue Types, which is related to the section about Histology and Cells (incl.
structure of animal cells, cell division, mitosis, meiosis).