5 Flashcards
What is tissue?
Tissue is a group of similar cells that perform a common function.
What are the four primary types of tissue in the body?
The four primary types of tissue are epithelial, connective, muscle, and nervous.
What is epithelial tissue?
Epithelial tissue is composed of tightly packed cells that form a continuous layer, which covers and lines body surfaces and organs.
What are the two main types of epithelial tissue and what are their functions?
The two main types of epithelial tissue are coverings and linings and glandular. Coverings and linings protect, absorb, secrete, and excrete. Glandular epithelium produces and secretes substances.
What are the shapes of epithelial cells and what are their functions?
The shapes of epithelial cells include squamous (thin and flat), cuboidal (cube-shaped), and columnar (tall and column-like). Squamous cells allow for rapid diffusion, cuboidal cells secrete and absorb, and columnar cells secrete mucus and absorb nutrients.
What is connective tissue?
Connective tissue supports, protects, and binds organs. It is the most abundant and diverse type of tissue in the body.
What are the three types of fibers found in connective tissue and what are their functions?
The three types of fibers found in connective tissue are collagen (strong and flexible), elastic (stretchy), and reticular (fine, branching fibers that form a network). They provide strength, elasticity, and support.
What is muscle tissue?
Muscle tissue contracts to produce movement.
What are the three types of muscle tissue and where are they found?
The three types of muscle tissue are skeletal (attached to bones), cardiac (found only in the heart), and smooth (found in the walls of hollow organs).
What is nervous tissue?
Nervous tissue contains cells that transmit and receive electrical impulses, allowing for communication between different parts of the body.
What are the two types of cells found in nervous tissue and what are their functions?
The two types of cells found in nervous tissue are neurons (transmit and receive electrical signals) and neuroglia (support and protect neurons).
What is a tissue membrane?
A tissue membrane is a thin layer of tissue that covers and lines body surfaces and organs.
What are the four types of tissue membranes and where are they found?
The four types of tissue membranes are mucous (lines body cavities that open to the exterior), serous (lines body cavities that do not open to the exterior), cutaneous (covers the body surface), and synovial (lines joint cavities).
What is the difference between endocrine and exocrine glands?
Endocrine glands secrete hormones directly into the bloodstream, while exocrine glands secrete substances into ducts that lead to body surfaces or organs.
What is skeletal muscle?
Skeletal muscle is a type of striated muscle that is attached to bones and responsible for voluntary movement.
What is a muscle fiber?
A muscle fiber is a single, multinucleate cell that makes up skeletal muscle tissue.
What is a myofibril?
A myofibril is a cylindrical structure within a muscle fiber that contains contractile proteins called actin and myosin.
What is a sarcomere?
A sarcomere is the smallest functional unit of a muscle fiber, consisting of overlapping actin and myosin filaments.
What is the sliding filament theory?
The sliding filament theory is the explanation for how muscle contraction occurs. It states that the actin and myosin filaments slide past each other, causing the sarcomere to shorten.
What is the neuromuscular junction?
The neuromuscular junction is the point where a motor neuron meets a skeletal muscle fiber. It is the site of communication between the nervous system and the muscular system.
What is the role of acetylcholine in muscle contraction?
Acetylcholine is a neurotransmitter that is released by motor neurons at the neuromuscular junction. It binds to receptors on the muscle fiber, causing depolarization and muscle contraction.
What is muscle tension?
Muscle tension is the force exerted by a contracting muscle. It can be measured in pounds or newtons.
What is muscle tone?
Muscle tone is the continuous, low-level contraction of skeletal muscle fibers. It helps to maintain posture and stabilize joints.
What is muscle fatigue?
Muscle fatigue is the decline in muscle tension and/or the inability to maintain a given level of muscle tension. It can be caused by factors such as depletion of energy stores or accumulation of waste products in the muscle.