The arterioles in the skeletal muscles dilate‚ which increases blood flow to the muscles and leads to an overall drop in peripheral resistance. At the same time there is vasoconstriction in the vessels supplying blood to the abdominal organs and kidneys. This makes sense: if an individual was running from an attacking lion‚ digestion wouldn’t be a high priority while the muscles involved in escape would be. Another cardiovascular response to exercise
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Connective tissue generally provides structure and support to the body. There are two types of connective tissue: Loose connective tissue holds structures together. For example‚ loose connective tissue holds the outer layer of skin to the underlying muscle tissue. This tissue is also found in your fat layers‚ lymph nodes‚ and red bone marrow. Fibrous connective tissue also holds body parts together‚ but its structure is a bit more rigid than loose connective tissue. Fibrous connective tissue is found
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One of the main physiological changes that occur within the cardiovascular system in response to exercise is heart rate. When engaging in exercise‚ the amount of energy required increases instantaneously within the skeletal muscles. This sudden demand creates increasing stress on the cardio-respiratory system to remove the waste products and carbon dioxide from the cells and provide more oxygen for the working cells. This surge of extra energy that is needed requires the heart to pump faster and
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What Is Resistance/Weight Training? Resistance/ weight training is any type of exercise that causes the skeletal muscles to contract and detract with the resistance of an outside force. This outside resistance can be produced in many ways‚ a few examples are: dumbbells‚ rubber exercise tubing‚ your own body weight‚ bricks‚ bottles of water‚ or any other object that causes the muscles to contract. A common name for this exercise is weight lifting. There are many different exercises that fall within
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Organization Checkpoint Questions 1. Define histology: Histology is the study of tissues 2. List the four basic types of tissues in the body: a. Epithelial tissue b. Connective tissue c. Muscle tissue d. Neural tissue 3. List five important characteristics of epithelial tissue: a. The cells are bound closely together b. A free surface exposed to the environment or internal chamber/passageway c. Attachment to underlying connective tissue
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organ atrophy the entire organ will decrease in size. Thymus atrophy during early human development (childhood) is an example of physiologic atrophy. Skeletal muscle atrophy is a common pathologic adaptation to skeletal muscle disuse (commonly called "disuse atrophy). Tissue and organs especially susceptible to atrophy include skeletal muscle‚ cardiac muscle‚ secondary sex organs‚ and the brain. Hypertrophy is an increase in cell size. If enough cells of an organ hypertrophy so will the whole organ.
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Ball-and-Socket Joint Joints are essential in allowing movement of the human body. They are located at the intersection of bones‚ and their structures determine the type of movement that will occur at that location. Each joint contains components of the skeletal and muscular systems and connective tissues that function together to allow movement to occur. A ball-and-socket joint is one example of a synovial joint. In a ball-and-socket joint‚ the round head of one bone rests within a cup-shaped depression
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by the process of chewing and grinding by the help of the chemical action of salivary enzymes. After being chewed and swallowed‚ the food enters the ESOPHAGUS‚ a long tube that runs food from the mouth to the stomach through the help of a wave-like muscle movement called peristalsis. The STOMACH is a large‚ sack-like organ that blends the food with a very strong gastric acid. After being in the stomach‚ food enters the SMALL INTESTINE‚ where bile (produced in the liver and stored in the gall bladder)
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System Animations 1. How do nerve impulses cause muscle contraction? Skeletal muscle is under voluntary control. Nerve impulses that originate in the central nervous system cause muscles to contract. Both neurons and muscle tissue conduct electrical current by moving ions across cellular membranes. A motor neuron ends in a synapse with a muscle fiber. The neuron releases acetylcholine and transfers the action potential to the muscle tissue. The signal will travel through the tissue and trigger
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Without bones and muscles‚ a human would not be able to live very long because the bones protect the organs and the muscles help the body move. Although many people go through their whole life without having a single problem with this system‚ there are many diseases that make everyday life seem like just another hurdle they have to get over. A muscle disease is Central Core Disease (CDC). CDC is a rare genetic disease from birth where the infant has weak muscles. Weak muscles cause the infant to
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