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Muscles
Which of the following muscles is named using the criterion of its size?
Sternocleidomastoid
Gluteus medius
Flexor digitorum profundus
Trapezius
“Medius” implies intermediate, in this case between the gluteus maximus and the gluteus minimus.
Author:
rikazzz
Comment
Muscles
Which list below has the superficial muscles of the superior medial thigh in the correct order from medial to lateral?
Gracilis, adductor longus, pectineus
Gracilis, pectineus, adductor longus
Adductor longus, gracilis, pectineus
Pectineus, adductor longus, gracilis
Gracilis is most medial while pectineus is most lateral.
Author:
rikazzz
Comment
Muscles
The energy for muscle contraction is derived from the mechanisms below EXCEPT for one. Which one is NOT a method of producing ATP?
Anaerobic glycolysis
Aerobic respiration
Direct phosphorylation of ADP by creatinine phosphate
Anaerobic digestion of lactic acid
ATP is not produced from lactic acid – lactic acid is produced from pyruvic acid after glucose is anaerobically lysed into ATP and pyruvic acid.
Author:
rikazzz
Comment
Muscles
When a muscle contracts, exactly what structure gets shorter?
The fascicles of a muscle
The myosin molecules of a myofilament
The actin molecules of a myofilament
The sarcomeres of a myofibril
The length of the sarcomeres decreases.
Author:
rikazzz
Comment
Muscles
What is the role of calcium ions in muscle contraction? To:
Bind to troponin, thus changing its shape and pulling it away from the actin molecule
Cause the myosin cross-bridge to detach from its binding site
Cause the action potential to propagate along the sarcolemma
Bind with ADP during aerobic respiration to produce ATP to provide energy
Calcium binds to troponin. All other choices are wrong statements.
Author:
rikazzz
Comment
Muscles
What does aerobic respiration refer to?
Glycolysis in the cytoplasm in the absence of oxygen
Oxidative phosphorylation in the mitochondria in the presence of oxygen
Glycolysis in the liver in the presence of oxygen
Gluconeogenesis in the liver in the absence of oxygen
Respiration occurs in the mitochondria of a cell. The term aerobic refers to the presence of oxygen.
Author:
rikazzz
Comment
Muscles
What are the muscles known as gluteus maximus, gluteus medius and gluteus minimus named according to? Their:
Size
Shape
Whimsy
Direction of their muscle fibres
Maximus > medius > minimus
Author:
rikazzz
Comment
Muscles
What are the muscles known as triceps brachii, biceps femoris and quadriceps femoris named according to? Their:
Relative size and location of muscle’s origin
Number of origins and location in the body
Shape of muscle and direction of muscle fibres
Number of insertions and location in the body
Bi-, tri- and quad- refer to the number of origins, while the second word refers to location (arm or femur).
Author:
rikazzz
Comment
Muscles
Which of the listed muscles is named according to its action?
Rectus abdominis
Peroneus longus
Pronator teres
Latissimus dorsi
The pronator teres pronates the forearm (turns the radius so that it crosses over the ulna).
Author:
rikazzz
Comment
Muscles
Which muscle is located on the front of the anatomical leg?
Tibialis anterior
Rectus femoris
Sartorius
Flexor carpi radialis
The “leg” is between the knee and ankle – it contains the tibia and fibula. Anterior refers to the “front”, hence tibialis anterior. The other muscles are not on the leg. Rectus femoris is on the front of the “thigh”.
Author:
rikazzz
Comment
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