Human Body Quiz Test your knowledge of the human body by taking our fun human body quiz.
There are three types of muscle tissue: Visceral, cardiac, Anatomy 2 quiz skeletal. Visceral Muscle Visceral muscle is found inside of Anatomy 2 quiz 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. Skeletal muscle derives its name from the fact that these muscles always connect to the skeleton in at least one place.
Gross Anatomy of a Skeletal Muscle Most skeletal muscles are attached to two bones through tendons. Tendons are tough bands of dense regular connective tissue whose strong collagen fibers firmly attach muscles to bones.
Tendons are under extreme stress when muscles pull on them, so they are very strong and are woven into the coverings of both muscles and bones. Muscles move by shortening their length, pulling on tendons, and moving bones closer to each other. One of the bones is pulled towards the other bone, which remains stationary.
The place on the stationary bone that is connected via tendons to the muscle is called the origin. The place on the moving bone that is connected to the muscle via tendons is called the insertion.
The belly of the muscle is the fleshy part of the muscle in between the tendons that does the actual contraction. Names of Skeletal Muscles Skeletal muscles are named based on many different factors, including their location, origin and insertion, number of origins, shape, size, direction, and function.
Many muscles derive their names from their anatomical region. The rectus abdominis and transverse abdominis, for example, are found in the abdominal region. Some muscles, like the tibialis anteriorare named after the part of the bone the anterior portion of the tibia that they are attached to.
Other muscles use a hybrid of these two, like the brachioradialis, which is named after a region brachial and a bone radius. Some muscles are named based upon their connection to a stationary bone origin and a moving bone insertion.
These muscles become very easy to identify once you know the names of the bones that they are attached to.
Examples of this type of muscle include the sternocleidomastoid connecting the sternum and clavicle to the mastoid process of the skull and the occipitofrontalis connecting the occipital bone to the frontal bone. Some muscles connect to more than one bone or to more than one place on a bone, and therefore have more than one origin.To be a medical and biological resource for the study of anatomy and to be an informational source about the BlueLink Project.
Do you know these basics about the human body? A longitudinal wave is a wave in which the particles of the medium are displaced in a direction parallel to the direction of energy transport.
A longitudinal wave can be created in a slinky if the slinky is stretched out horizontally and the end coil is vibrated back-and-forth in a horizontal direction.
Anatomy and Physiology resource site. Includes photos, diagrams and lecture notes and has a comprehensive guide to the cat dissection. Muscle, contractile tissue found in animals, the function of which is to produce motion.. Movement, the intricate cooperation of muscle and nerve fibres, is the means by which an organism interacts with its alphabetnyc.com innervation of muscle cells, or fibres, permits an animal to carry out the normal activities of life.
An organism must move to find food or, if it is sedentary, must have. ANATOMY ATLASES & IMAGE DATABASES Anatomy Atlases & Image Databases Related Centers. FOR CT, CAT, MRA, MRI, X-RAY, ULTRASOUND ETC. ATLASES SEE THE RADIOLOGY CENTER FOR ANATOMY ATLASES - PATHOLOGY SEE THE PATHOLOGY, FORENSICS & VIROLOGY CENTER: PATHOLOGY CENTER FOR ANATOMY ATLASES - SURGERY SEE THE SURGERY .