Muscle contraction

of the muscle due to doing eccentric exercises. During the eccentric exercises, the muscle length is depended on the amount of damage being applied to the muscle fibers. If the muscle fibers are greatly damaged by eccentric exercises, the muscle length will get longer. Eccentric muscle contraction is when the muscle fibers increases in length to accommodate resistance. Also, the article explained the differences effects from concentric and eccentric exercise. Concentric muscle contraction is the…

A muscle tear refers to muscle fibers being damage (Virginia 2013). A tear in the gastrocnemius can cause great risk of injury since the gastrocnemius is located between the knee and ankle joint (Virginia 2013). This can be cause by direct trauma to the calf region or sudden landing on the foot (Medial Head Gastrocnemius 2006). This injury is common in tennis players due to the constant motions of jumping and lunging (Medial Head Gastrocnemius 2006). In the first degree of gastrocnemius tear,…

Its purpose is to receive oxygenated blood from the lungs and pumps the oxygenated blood to the rest of the body (organs and skeletal muscles). During exercise there is an increase in the supply of oxygen to the working muscles, this happens so that there is an increased generation of adenosine triphosphate (ATP) to support the continued contraction of the muscles. During this time CO2 is expelled though the heart pumping deoxygenated blood to the lungs. What exercise does to the heart. There…

becomes partially erect with a few seconds of erotic stimulation. Both the testes are drawn towards the perineum. The scrotum also becomes tense and thicken. Lasts from minutes to several hours. Then there is the swelling of the clitoris. The muscle that surrounds the vaginal opening becomes tighter. The vaginal walls also start to produce a lubricating the liquid. The breasts also increase in size and the nipples become hard. The rate and blood rate pressure increase. Breathing also…

1. Potentially, how could caffeine work to enhance human performance? Researchers believe that caffeine affects central and peripheral sites during submaximal contractions of varying speeds. Central nervous system activity may be impacted, quieting the sensations of pain and effort. Increased supraspinal motor unit activation accompanied by greater sarcolemmal and fast twitch motor unit excitability may also be elicited.1 The peripheral effects are equally important and focus on intracellular…

Blood pressure is the pressure applied by blood on the walls of blood vessels, it is controlled by a negative feedback system where heart rate and blood volume need to be altered in order to control the pressure. Local negative feedback systems and heart rate is regulated but the cardiovascular centre which also in turn controls neural and hormonal mechanisms. Neurons regulate heart rate and contractility and some neurons inhibit, stimulate or control heart rate by causing constriction which…

(a) The structure of the rotator cuff consists of four muscles that all play a role in the motion of the rotator cuff. The four muscles that are responsible for this motion are: the Supraspinatus muscle, the Infraspinatus muscle, the Teres Minor muscle, and the Subscapularis muscle. Each of these muscles originate from the scapula and attach into the humerus. The Supraspinatus muscle originates in the Supraspinatus Fossa and attaches to the greater tubercle of the humerus. The infraspinatus…

stretching is often referred to as slow or passive stretching. This slow, deliberate movement is used to achieve a lengthening of muscle that’ been stimulated. There has been much research done, exploring the effects of static stretching on performance of athletes. The results of these studies tend to point towards a positive reduction in injury. The ability to lengthen your muscle without damage may allow the athlete to assume an unusual position of which would have regularly resulted in…

then movements in teeth, digestive enzymes and four bilateral muscles accompany the bolus. These muscles comprise of the Temporalis, Lateral Pterygoid, Medial Pterygoid and the Masseter. Thereby, they conjoin into a single composed division of a nerve, which elevates, retracts, and protracts the lower jaw to or fro the neutral position. Correspondingly, they assist in the side-to-side movement within the jaw. Though, the Masseter muscle is proven to be the utmost significance in chewing as it…

other bone but is instead suspended in the soft tissue via ligaments and muscles (Romanes et al 1983). Different muscles such as infra and suprahyoid muscles and genioglossus muscle influence the position of the hyoid bone (Gray H, 1954) (Yamaoka et al 2003). Brodie points out that as man assumed an upright posture the head had to be balanced on the vertebral column. This is attained by equal anterior and posterior muscle tension relative to the occipital condyles. In…