Exam 3: Mastering – Flashcards

The fundamental repeating unit of the myofibril, called a ________, gives skeletal muscle its striated appearance and is bordered by ________.

What is the region if the striated muscle's banding patterns that contains only the connections between the tails of myosin molecules and is the mid-point of the sarcomere?

Which of the following stores calcium to be released for muscle contraction?

The repeated, oscillating interaction between actin and myosin which results in the generation of force by a skeletal muscle cell is called what?

What converts the myosin head into the high-energy state?

The releasing of an inorganic phosphate from the myosin molecule directly results in which of the following?

In order for crossbridge cycling to occur, the actin-myosin complex must be broken by which of the following?

What is the region of thin filaments that has no overlap with thick filaments called

Which of the following is a property of isometric skeletal muscle contraction?

Constriction of motor units in a(n) __________ manner allows a muscle to maintain a smooth level of force for a duration of time without fatiguing.

Where are gap junctions commonly found?

What enzyme catalyzes the conversion of carbon dioxide and water to carbonic acid, and where is this enzyme located?

Pernicious anemia is associated with which of the following?

During hemoglobin metabolism, what is the yellow pigmented substance produced by the removal of the iron group called?

What cell type is the last stage of erythrocyte production prior to development of a mature erythrocyte?

Which of the following leukocytes is a phagocyte?

What type of leukocyte secretes heparin?

B cells and T cells fall under what category of leukocytes?

What type of cell is the precursor for platelets?

What is the stoppage of bleeding called?

Which of the following is the first step of hemostasis?

Platelets become sticky when exposed to which of the following?

What chemical dissolves blood clots?

The opening and closure of the atrioventricular and semilunar valves is driven by

Closure of the atrioventricular valve occurs when

What structure provides the pathway for the movement of electrical current between the cells of the conduction pathway and the ventricular muscle fibers?

Which of the following components of ECG represents ventricular repolarization?

The Q-T interval is the time from the onset of the QRS complex to the end o the T wave which measure the time of

The T-Q segment is the time from the end of the T wave to the beginning of the QRS complex which measures the time of

Which of the following is true of the ventricular filling phase of the cardiac cycle?

What phase of the cardiac cycle is the heart in when all four valves of the heart are closed and ventricular pressure is building, but is not yet great enough to open a valve?

Ejection of blood from the right ventricle will continue until

The small increase in ventricular pressure observed late in diastole is caused by

the end-diastolic volume minus the end-systolic volume is the

Which of the following is an effect of parasympathetic activity to the heart?

Under resting conditions, heart rate is primarily under the control of what control system?

In comparison to the systemic circuit, the pulmonary circuit

The elastic nature of the largest blood vessel's walls allow them to act as a ____________, maintaining the driving force for blood flow while the heart is relaxed during diastole.

The blood vessels of largest diameter are the _________, and the blood vessels with the thickest walls are the ________.

An increase in total peripheral resistance, in the absence of any change in cardiac output, would

What are the two functions of increasing blood flow to the skin during exercise?