Human Phys Exam 3 Practice Test

Which of the following is NOT a property of glycolytic fibers as compared to oxidative fibers? a) high capacity for lactic acid production b) fewer capillaries c) absence of myoglobin d) poor ability to produce ATP in the absence of oxygen e) readily fatigable

An increase in venous return would result in a(n) ________ a) increased end-systolic volume b) decreased end-systolic volume c) decreased end-diastolic volume d) increased end-diastolic volume e) increase mid-systolic volume

Blockage of cardiac arteries is most likely to lead to

A skeletal muscle is composed of many _____, each of which is composed of many ______, which in turn are composed of _______.

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

Place the sequence of a skeletal muscle contraction in order: 1. Ca++ binds to troponin 2. End Plate Potential becomes Action Potential on surface of membrane 3. Tropomyosin moves aside 4. Actin binds to myosin 5. Action potential moves into T tubules 6 Ca++ released from SR 7. Cross-bridge cycling occurs 8. Ca++ pumped into SR

The latent period of muscle contraction is the

What percent of your blood plasma is water?

The energy source that can be used most rapidly by contracting muscle is: a) ATP produced from glycolysis b) ATP produced from Krebs cycle c) ATP produced from creatine phosphate d) ATP produced from oxidative phosphorylation e) Both b and d combined

Which of the following is NOT an accurate description of specific muscle fiber types? a) Fast glycolytic fibers are the largest diameter fibers. b) Slow oxidative fibers are th e smallest diameter fibers. c) Slow oxidative fibers are quick to fatigue. d) Fast glycolytic fibers produce their ATP by glycolysis. e) Fast oxidative fibers have a high mitochondrial density.

In which type(s) of muscle can functiona l units of muscle cells act independently?

In what type of muscle does Ca++ activate calmodulin?

What type of muscle contain(s) thin filaments made of actin and thick filaments made of myosin?

What type of muscle can generate action potentials myogenically (i.e., on its own)?

What type of muscle can gene rate slow wave potentials?

Part A of Fig 1 is caused by a decrease in the outward leak of _____, while at the same time an increase occurs in the inward leak of ______ by ________. Question 16 (page 11)

Indicate which is the proper sequence of blood flow though the circulatory system: 1. right atrium - 2. left atrium 3. right ventricle - 4. left ventricle 5. pulmonary artery - 6. pulmonary vein 7. lungs - 8. systemic tissues 9. aorta - 10. venae cavae

How does the frequency of muscle stimulation influence the strength of contraction of the whole muscle?

Part C of Fig 1 is caused by _______ ions ________ the cell by the process of _________.

The parasympathetic decreases heart rate by changing the following properties of the SA node: _________ Na+ leaks into the cells, _______ Ca++ leaks into the cells, and _______K+ leaks out of the cells, all of which make the membrane potential more ________.

Which of the following is the correct conduction pathway through the heart?

What is a motor unit?

Place the sequence of cross-bridge cycling in order: 1. Ca++ released from SR 2."Power stroke" as myosin pulls actin forward 3. ATP split into ADP and Phosphate on myosin 4. Myosin binding site on actin exposed 5. ADP released by myosin 6. ATP binds myosin 7. Actin releases myosin

Given that the net filtration of fluid out of the capillaries averages about 3 liters per day, how is blood volume maintained in light of this apparent fluid loss?

Which of the following is (are) NOT true of arterioles?

Part 0 of Fig. 2 is caused by _______ ions ________ the cell by the process of ______

Which of the following would you expect in a trained endurance athlete versus an untrained person?

Which of the following statements about contraction of cardiac contractile cells is false?

The binding of epi and/or norepi to ______ receptors on contractile cells in the ventricles will increase contractile strength of ventricles by _______ the Ca++ permeability of the cells, ______ Ca++ movement out of the SR, _______ the rate of myosin ATPase activity and _____ the rate of pumping Ca++ back into the SR.

Which of the following functions in forming blood clots? a) erythrocytes only b) leukocytes only c) platelets only d) both erythrocytes and leukocytes e) both leukocytes and platelets

Which of the following would NOT cause arterioles to vasodilator? a) Increased CO2 in the surrounding tissue b) Binding of epi by beta-2 receptors on the arteriole c) Histamine release in the surrounding tissue d) Increased O2 in the surrounding tissue e) Neither c nor d would cause vasodilatation

Capillary exchange is facilitated by

Bulk flow is most important for

Your hematocrit level is

Choose the correct order of the steps of synaptic transmission at the motor end plate are listed. 1. Acetylcholine binds to postsynaptic receptors. 2. Acetylcholine is released. 3. A graded depolarization is produced. 4. An action potential is produced on the muscle cell membrane. 5. Channels for both sodium and potassium are opened. 6. Voltage-gated calcium channels on the plasma membrane open. 7. An action potential arrives at the axon terminal.

Indicate the proper sequence of events during hemostasis: 1. fibrin produced from fibrinogen 2. inhibition of prostacyclin production 3. release of cascade of clotting factors 4. platelet attachment to damaged collagen 5. vascular spasms

End Diastolic Volume is 150 ml/beat, End Systolic Volume is 80 ml/beat, and heart rate is 60 beats/min. What is the stroke volume? What is the cardiac output?

Which of the following statement about pressure are true?

During smooth muscle contraction, Ca++ enters the cell primarily from the ______ via the process of __________. The Ca++ then activates _________, which in turn activates ______ to phosphorylate myosin so that cross bridge cycling between thick and thin filaments occurs. At the end of the contraction, Ca++ is removed from the cell by the process of _______

Which of the following does NOT occur during the "oxygen debt" recovery from exercise?

Ventricular fibrillation is

Asynchronous recruitment of skeletal muscle

Which of the following statements about the heart are true?

Which of the following could cause a pacemaker potential?

Ischemic heart disease is

Conduction of action potentials through which of the following is slow to allow atria to contract before ventricles?

In Fig 1 part A is called _____; part C of Fig 1 is called ____

The flat thin structure of red blood cells facilitates

In Fig 2 part A is called ______; part D of Fig 2 is called _______.

In what type of muscle are cells linked by gap junctions?

Which type(s) of muscle show(s) a clear cut relationship between muscle length and muscle tension?

Part B of Fig. 3 is caused by

End Diastolic Volume is 150 ml/beat, End Systolic Volume is 80 ml/beat, and heart rate is 70 beats/min. What is the Cardiac Output?

90% of plasma is

In smooth muscle, calcium triggers contraction by binding to what protein?

Part 2 of Fig. 4 is caused primarily by

When an action potential is generated within a motor neuron, ________

If the hematocrit is 45, about what percentage of the whole blood is red blood cells?

Mobile units of the immune system are