Myofibril - Study guides, Class notes & Summaries

Skeletal muscle - an organ specialized for contraction, composed of striated muscle fibers (cells), supported by connective tissue, attached to bone by a tendon or aponeurosis, and stimulated by somatic motor neurons Sarcomere - any of the repeating structural units of striated muscle Sliding filament mechanism - the explanation of how thick and thin filaments slide relative to one another during striated muscle contract to decrease sarcomere length Insertion - the attachment of a muscle t...

What are the three types of joints? -ellipsoidal - ball and socket -hinge and joint What are skeletal movements controlled by? skeletal muscles What are muscles connected to bone by _____? tendons Each muscle is a large bundle of many smaller _______? muscle fibers Muscles exert force by ______ - they can only ______ a limb not ______ it. contracting - shortening of the fibers - pull not push it What are the two antagonistic muscles? flexors Extensors Flexors contraction bends the joint - ...

IB Biology Midterm Study guide Exam Questions With 100% Correct Answers 1. Which are examples of homologous structures? A. The wings of bats and butterflies B. The fins of fish and whales C. The hindlimbs of frogs and grasshoppers D. The forelimbs of primates and penguins - answerD. The forelimbs of primates and penguins 2. Which is an example of natural selection? A. A giraffe stretching its neck to reach higher leaves B. A juvenile bird learning to sing C. Development of antibiotic ...

1. Myocyte Muscle cell 2. Sarcolemma Plasma membrane of myocyte 3. Sarcoplasm Cytoplasm of myocyte 4. Myofibril Tightly packed filament bundles found within skeletal muscle fibers. Contractional unit of a muscle cell. 5. Sarcoplasmic reticulum Site of calcium storage in a muscle cell. Surrounds the myofibrils 6. Transverse tubules (T-tubule) Inward extensions of the sarcolemma that dive into the muscle fiber and surround each myofibril to form a tunnel- like network within the musc...

What is the function of the tricuspid valve? A. It acts as a pacemaker. B. To pump blood through the heart. C. Prevents backflow of blood to the left atrium. D. Prevents backflow of blood to the right atrium. correct answers Answer: D What is the fundamental unit of muscle contraction? A. Myofibril B. Sarcomere C. Myosin D. Sarcolemma correct answers Answer: B Which chamber of the heart is responsible for pumping oxygenated blood to the body? A. Right ventricle B. Left ventricle ...

What is the function of the tricuspid valve? A. It acts as a pacemaker. B. To pump blood through the heart. C. Prevents backflow of blood to the left atrium. D. Prevents backflow of blood to the right atrium. - Answer-Answer: D What is the fundamental unit of muscle contraction? A. Myofibril B. Sarcomere C. Myosin D. Sarcolemma - Answer-Answer: B Which chamber of the heart is responsible for pumping oxygenated blood to the body? A. Right ventricle B. Left ventricle C. Right atrium ...

IB Biology Midterm Study guide Exam Questions With 100% Correct Answers 1. Which are examples of homologous structures? A. The wings of bats and butterflies B. The fins of fish and whales C. The hindlimbs of frogs and grasshoppers D. The forelimbs of primates and penguins - answerD. The forelimbs of primates and penguins 2. Which is an example of natural selection? A. A giraffe stretching its neck to reach higher leaves B. A juvenile bird learning to sing C. Development of antibiotic ...

IB Biology Midterm Study guide Exam Questions With 100% Correct Answers 1. Which are examples of homologous structures? A. The wings of bats and butterflies B. The fins of fish and whales C. The hindlimbs of frogs and grasshoppers D. The forelimbs of primates and penguins - answerD. The forelimbs of primates and penguins 2. Which is an example of natural selection? A. A giraffe stretching its neck to reach higher leaves B. A juvenile bird learning to sing C. Development of antibiotic ...

Anatomy - answer-The study of structure 4 areas of Anatomy - answer-Histology, Gross Anatomy, Neuroanatomy, and Embryology. What is "inextricably linked in Anatomy?" - answer-Form and function What is a molecule? - answer-Group of atoms bonded together A molecule is on what level? - answer-Chemical level cells - answer-smallest living structures and are formed from atoms and molecules cells are found at which level? - answer-cellular level Tissues - answer-similar cells th...

How humans detect visual, auditory, olfactory, and gustatory signals Ans: ear has mechanoreceptors to indicate movement hearing-vibrations of tympanic membrane to cochlea corti- vibrations of basilar membrane bends hairs fused to tectorial membrane seeing- light receptors contain pigment that chemically alter with light exposure cone cells= color blindness taste-5 different taste buds Structure of muscle tissue how it contracts cardiac vs skeletal muscle Ans: myofibril and sacromere fi...