BIO 110 Physiology Quiz 2 Study Guide

BIO 110 Physiology Quiz 2 Study Guide Tendon connect muscle to bone Ligament connects bone to bone Motor unit One motor neuron, plus all of the muscle fibers it innervates. one motor neuron innervates many muscle fibers. Somatic motor neurons innervate skeletal muscle. Thick filament mysoin. A band extends length M line connects thick filaments together Thin filament Actin Sarcomere thick myosin. Shortening of sarcomere when muscle is contracted. Functional unit of skeletal muscle. Z lines links thin filaments together to a muscle fiber Polycythemia high count/increase of RBC (erythrocytes) Origin of muscles the attachment site of the muscle to a bone (stationary) that does not move during contraction Insertion of muscles part of the muscle that moves the joint Hypoxia low levels of oxygen in tissue Hypoxemia low levels of oxygen in the blood Anemia deficiency of RBC or hemoglobin in the blood. decreased oxygen carrying capacity Hemostasis stoppage of bleeding Three steps of hemostasis 1. vascular spasm: damage of blood vessels 2. platelet plug: forms around the site of vessel damage, which decreases blood loss 3. formation of a blood clot: coagulation occurs around platelet plug Adrenergic receptors alpha and beta Alpha receptors alpha 1: blood vessels, alpha 2: cns Beta receptors beta 1: heart, beta 2: lungs, Beta 3: adipose