It is important for a muscle to be attached to a fixed origin and a moving insertion because the immovable and movable bones attached on either side of the attached muscle, causing angular movements that change the angle of two bones. When the muscles contractacross the joints, they move towards the fixged origin by using the moving insertion. In order for the biceps to lift weights, they must use flexion and tension. Flexion describes the straightening of the muscle that increases the angle. Extension is when the joint moves in a posterior
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.
“Accepting or Rejecting Innovation” by Jared Diamond, discusses about the factors and processes of adopting new innovations. Diamond explained how innovations, no matter how progressive and efficient it is can be delayed or not used at all. The first factor that decide the new technology can be used is the economic advantage. This is the most obvious, according to the author is if the technology can provide an economic advantage, society would more readily support it. The wheel was used as an example in Native American society, compared to industrial nations, it was not as valued economically due to the lack of domesticated animals. The second factor that the author list was the social and prestigious value of the innovation also plays a crucial
There are about 600 muscles in the body working together to create movement. Muscle contractions pull both ends of the muscle towards one another. One bone attached to each muscle is always more stabilized than the other. The less stabilized bone moves during muscle contraction due to the weaker stability. The points of attachment determine which bone will move. The least movable part is called the origin; it is the part that attaches closer to the midline of the body. This leaves the most movable part called the insertion. Each of these points can be identified in individual muscles to assist trainers in understanding how the muscles and joints work together to create motion.
Individual muscles are made up of individual muscle fibers and these fibers can be further organized into a motor unit grouped within each muscle. A motor unit is simply a bundle of grouped muscle fibers. When you want to move the brain instantaneously sends a signal or impulse through the spinal cord that reaches the motor unit. Muscle fibers are cells like the basic building block of the muscle. There are a few different types of muscle fibers, each are designed for a specific type of muscle activity. Some muscle fibers are good for endurance exercises, other work best for the short bursts. Each muscle fiber is a single cell. Each cell consists of a structure.
The antagonist is the posterior deltoid, latissimus dorsi, and triceps brachii. When the shoulder performs extension the agonist (prime mover) is posterior deltoid and latissimus dorsi. The antagonist is anterior deltoid and pectoralis major. During shoulder adduction the agonist muscle is the latissimus dorsi and pectoralis major; the antagonist muscle is the deltoid (middle). When shoulder abduction is performed the agonist muscle is the deltoid (middle) and the antagonist muscle is the latissimus dorsi and pectoralis major (FCG, 2016). In wrist flexion the agonist muscle is flexor digitorum and the antagonist is extensor digitorum. When performing wrist extension the agonist muscle is the extensor digitorum and the antagonist is flexor digitorum. In elbow flexion the agonist muscle is the biceps brachii and the antagonist muscle is triceps brachii. During elbow extension the agonist muscle is the triceps brachii and the antagonist muscle is biceps brachii. In trunk flexion the agonist muscle is the rectus abdominis and the antagonist muscle is erector spinae. When performing trunk extension the agonist muscle is the erector spinae and the antagonist muscle is rectus abdominis (BBC, 2016). During hip flexion the agonist muscle is the illiopsoas/quadriceps and the antagonist muscle are gluteus maximus/hamstrings. When performing hip extension the agonist muscle is the glueteus maximus/hamstrings and the antagonist are lliopsoas/quadriceps. During knee flexion the agonist muscle is the hamstring and the antagonist are quadriceps. When performing knee extension the agonist muscle are the quadriceps and the antagonist are the hamstrings. During dorsiflexion the agonist muscle are the tibialis anterior and the antagonist are gastrocnemius/soleus. When plantar flexion is performed the agonist muscle is the gastrocnemius/soleus and the antagonist are
The prime movers in the left shoulder that move it back to its neutral position are the anterior deltoid and the bicep brachii. Concentric contractions followed by eccentric contractions of both of these muscles move the shoulder from extension and abduction to it neutral state by flexing and adducting the shoulder. The prime movers in the right shoulder are again the anterior and middle deltoid along with the supraspinatus that contract isometrically to keep the shoulder in horizontal abduction. When the right shoulder is let down after follow through, the prime movers are the triceps and the posterior deltoids which eccentrically contract to extend the shoulder to its neutral position. Therefore the muscles of the shoulder are exceedingly imperative to the action of shoot a
Stability of the elbow joint is achieved from the elbow osseous structures and the surrounding soft tissues [1, 2, 3, 4, 5]. Primary stability at elbow flexion less than 20° and more than 120° is imparted by the olecranon fossa articulation. However, in the dynamic range of motion predominantly used by baseball pitchers (20–120° of flexion), soft tissue structures are responsible for primary stability of the elbow [1, 2, 3]. For this reason, baseball pitchers are at higher risk of soft tissue injury at the elbow [1, 2,
Similarly, to today, women were crucial in the Colonial Period, however, women were looked upon differently as they are today. In the 1600s and 1700s, women had many things happening around them, but for the most part they were kept busy at home, hidden from the world (Myers 1). Life in Colonial America was very difficult. The early women were expected to help the men in a variety of hard labor tasks in order to survive. As time passed, the lives of the colonial women took on the traditional roles of women (“History of the First 13 Colonies and Life in the Colonial Period” 1).
Skeletal muscle contractions play a pivotal role in our day-to-day lives. Their main function is to generate force and provide our bodies with structural integrity. For many of us, muscle contractions seem effortless, but there’s actually quite a bit going on under the surface. Our muscles are composed of sarcomeres, units of skeletal muscle fibers, which are made up of actin and myosin contractile filaments. These filaments need to bind to each other in order to lengthen and shorten the sarcomere. However, the binding sites for actin and myosin are blocked by troponin and tropomyosin proteins. In order to get them off of the binding sites, calcium needs to bind to the troponin, which then lifts
The shoulder is a ball and socket joint which allows it a flexion and extension motion.
Muscles origin are always connected to the immovable bone, on the other side, the intersection is connected to the movable bone. Movement of the body occurs when muscles contract across joints and their attachments move toward the origin. Movements that are called Angular can increase or decrease the angle between the bones. Flexion can decrease the angle of the joint and can make the articulating bone come closer, an example could be nodding you head. An extension is the opposite and can make the angle larger.
The muscular system is responsible for the movement of the human body. Without muscle, humans could not live. Attached to the bones of the skeletal system are about 700 muscles. Muscles produce not only those movements that are under the control of our will and that we can see and feel, but are responsible for everyday activities like breathing, digestion of food, pumping of blood.
The tendon is a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone. The origin is the end that doesn’t move when the contraction occurs, while the insertion is the moves with the contraction. The superficial is the thin layer of loose fatty connective tissue underlying the dermis and binding it to the parts beneath it. The antagonist in a movement refers to the muscles that oppose the agonist. During elbow flexion where the bicep is the agonist, the tricep muscle is the antagonist. The synergist in a movement is the muscle(s) that stabilises a joint around which movement is occurring, which in turn helps the agonist function effectively. Synergist muscles also help to create the movement. In the bicep
The next stop in our body system is the muscular system. The muscles in our body help us move all of the organs in our body without them we would be a statue.
While some guys are born with a naturally muscular body, the majority of us have to work very hard for it. One of the greatest challenges in building muscle is learning the right techniques and strategies to maximize your muscle growth. For most beginners the bad habits they learn without proper guidance will have them reach their muscle gaining plateau very quickly. For some this is enough to give up; thinking that they just can't build muscle.