exam 3

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a. G.

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exam 3


exam 3Versión en línea 45 questions por a. G. 1 Cross-bridge formation occurs when myosin heads attach to actin molecules located in the thin filaments. a True b false 2 A cell is only able to respond to hormones if specific hormone receptors are present on the membrane or within the cell. a True b False 3 The _______________________ autonomic division is dominant in an emergency situation. a Sympathetic b Fight or flight c Motor unit d hormones 4 When two or more hormones work together to produce a particular result, their effects are_________. a Antagonistic b Permissive c Synergistic d Inhibitory 5 Cardiac output is equal to_________. a stroke volume / cardiac rate b stroke volume − cardiac rate c stroke volume × cardiac rate d stroke volume + cardiac rate 6 Transverse tubules contain voltage-gated calcium channels that respond to membrane depolarization, and are directly coupled to the calcium release channels in the sarcoplasmic reticulum. a true b False 7 Thin filaments are composed of myosin and tropomyosin. a False b True 8 The circulatory system is able to provide regulation of other body systems by circulating_________. a Hormones b Clotting 9 Each somatic motor neuron and all of the muscle fibers it innervates is called a ________ a Hormones b Motor unit c synergistic d Neuromuscular junction 10 Hormones released from the adrenal medulla prolong and enhance the fight or flight response. a False b true 11 The amount of blood ejected by the ventricles per beat is termed the_________. a cardiac output b end-diastolic volume c blood pressure d stroke volume 12 Which of the following is a catecholamine? a Nitric oxide b Acetylcholine c All of the choices are correct. d Norepinephrine 13 For muscle contraction to occur, ATP and its hydrolyzed forms are needed for the_________. a pumping of Ca2+ back into the sarcoplasmic reticulum b attachment of myosin cross-bridges to actin c All of the choices are correct. d release of myosin cross-bridges from actin 14 Systole refers to the_________ of the ventricles, when pressure is_________. a relaxation; lowest b blood flow; lowest c filling; highest d contraction; highest 15 Closure of the atrioventricular valves occurs at the end of diastole/beginning of systole. a False b True 16 "Synapses en passant" refers to the fact that postganglionic autonomic neurons release neurotransmitter_________. a from the axon terminal b along the length of the axon c from the soma d only when receptors pass over the axon 17 The posterior pituitary gland_________. a releases its hormones in response to stimulation by hormones from the hypothalamus b synthesizes oxytocin, which plays a vital role in inducing labor c releases hypothalamic hormones, but does not produce its own d regulates the secretion of hormones produced in the anterior pituitary gland 18 Cortisol secretion would cease if the_________ no longer secreted ACTH. a anterior pituitary gland b adrenal cortex c posterior pituitary gland d Hypothalamus 19 What protein primarily makes up the thick filament? _________________ a Pituitary gland b Acetylcholiine c Titin d Myosin 20 Norepinephrine is released from_________ neurons, causing heart rate to_________. a sympathetic; increase b parasympathetic; increase c sympathetic; decrease d parasympathetic; decrease 21 What is the function of antidiuretic hormone (ADH)? a Stimulates retention of water by the kidneys b Causes a darkening of the skin c Stimulates loss of water by the kidneys d Causes large urine volume 22 Cardiac output increases as heart rate increases. a false b true 23 Slow-twitch fibers have a________ oxidative capacity and________ glycogen content. a high; high b low; low c high; low d low; high 24 Which molecule blocks the myosin head from binding to actin in a relaxed muscle? a Calcium b Troponin c Tropomyosin d Titin 25 What element is necessary for production of thyroxine? a Calcium b Chlorine c Iodine d Sodium 26 Increased motor unit recruitment causes_________ force generation by a muscle. a decreased b no change in c Increased 27 The movement of the troponin-tropomyosin complex requires_________. a Na+ b ATP c Ca2+ d acetylcholine 28 The molecules secreted by endocrine glands that are inactive until changed by their target cells are_________. a tissue hormones b Prohormones c lipophilic hormones d prehormones 29 Somatic motor neurons release the neurotransmitter_________ at the neuromuscular junction. a Serotonin b Norepinephrine c acetylcholine d Dopamine 30 What is the structural and functional unit of skeletal muscle? a Myofibril b Sarcomere c A band d I band 31 Cardiac_________ channels are called hyperpolarization cyclic nucleotide (HCN) channels because they open in response to hyperpolarization. a Purkinje b Atrial c pacemaker d Ventricular 32 A deficiency of dietary iodine would result in excessive TSH secretion. a false b true 33 Somatic motor reflexes may result in_________. a contraction of skeletal muscle b inhibition of smooth muscle contraction c contraction of smooth muscle d Vasoconstriction 34 The vascular link between the hypothalamus and the_________ is called the hypothalamo-hypophyseal portal system. a thalamus b pineal gland c anterior pituitary d posterior pituitary 35 Some glands throughout the body have both endocrine and exocrine functions. a false b true 36 As cardiac muscle is stretched, it contracts less forcibly. a false b true 37 What structures carry the action potentials into the interior of the muscle to cause muscle contraction? a Ryanodine receptors b Terminal cisternae c Sarcoplasmic reticula d T tubules 38 Most of the circulating blood can be found in_________. a Capillaries b Arterioles c Veins d arteries 39 The pancreas secretes hormones involved in the regulation of_________. a growth and reproduction b metabolic rate c blood glucose d the stress response 40 Most target organ control on the anterior pituitary gland is due to_________. a negative feedback b negative feedback inhibition c positive feedback inhibition d positive feedback effect 41 Blood flow is increased by_________. a vasodilation b vasoconstriction c edema d hypotension 42 Transportation functions of the circulatory system include carrying_________. a leukocytes b metabolic waste c All of the choices are correct. d absorbed products of digestion 43 In skeletal muscle, the pumps that actively transport calcium back into the_________ are called Ca2+-ATPase pumps. a sarcoplasmic reticulum b transverse tubules c neuromuscular junction d None of the choices are correct. 44 Endocrine glands secrete their products into ducts. a true b false 45 What part of the heart's conduction system acts as the primary pacemaker? a Atrioventricular (AV) node b Bundle of His c Purkinje fibers d Sinoatrial (SA) node

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exam 3Versión en línea

por a. G.

Cross-bridge formation occurs when myosin heads attach to actin molecules located in the thin filaments.

A cell is only able to respond to hormones if specific hormone receptors are present on the membrane or within the cell.

The _______________________ autonomic division is dominant in an emergency situation.

When two or more hormones work together to produce a particular result, their effects are_________.

Cardiac output is equal to_________.

Transverse tubules contain voltage-gated calcium channels that respond to membrane depolarization, and are directly coupled to the calcium release channels in the sarcoplasmic reticulum.

Thin filaments are composed of myosin and tropomyosin.

The circulatory system is able to provide regulation of other body systems by circulating_________.

Each somatic motor neuron and all of the muscle fibers it innervates is called a ________

Hormones released from the adrenal medulla prolong and enhance the fight or flight response.

The amount of blood ejected by the ventricles per beat is termed the_________.

Which of the following is a catecholamine?

For muscle contraction to occur, ATP and its hydrolyzed forms are needed for the_________.

Systole refers to the_________ of the ventricles, when pressure is_________.

Closure of the atrioventricular valves occurs at the end of diastole/beginning of systole.

"Synapses en passant" refers to the fact that postganglionic autonomic neurons release neurotransmitter_________.

The posterior pituitary gland_________.

Cortisol secretion would cease if the_________ no longer secreted ACTH.

What protein primarily makes up the thick filament? _________________

Norepinephrine is released from_________ neurons, causing heart rate to_________.

What is the function of antidiuretic hormone (ADH)?

Cardiac output increases as heart rate increases.

Slow-twitch fibers have a________ oxidative capacity and________ glycogen content.

Which molecule blocks the myosin head from binding to actin in a relaxed muscle?

What element is necessary for production of thyroxine?

Increased motor unit recruitment causes_________ force generation by a muscle.

The movement of the troponin-tropomyosin complex requires_________.

The molecules secreted by endocrine glands that are inactive until changed by their target cells are_________.

Somatic motor neurons release the neurotransmitter_________ at the neuromuscular junction.

What is the structural and functional unit of skeletal muscle?

Cardiac_________ channels are called hyperpolarization cyclic nucleotide (HCN) channels because they open in response to hyperpolarization.

A deficiency of dietary iodine would result in excessive TSH secretion.

Somatic motor reflexes may result in_________.

The vascular link between the hypothalamus and the_________ is called the hypothalamo-hypophyseal portal system.

Some glands throughout the body have both endocrine and exocrine functions.

As cardiac muscle is stretched, it contracts less forcibly.

What structures carry the action potentials into the interior of the muscle to cause muscle contraction?

Most of the circulating blood can be found in_________.

The pancreas secretes hormones involved in the regulation of_________.

Most target organ control on the anterior pituitary gland is due to_________.

Blood flow is increased by_________.

Transportation functions of the circulatory system include carrying_________.

In skeletal muscle, the pumps that actively transport calcium back into the_________ are called Ca2+-ATPase pumps.

Endocrine glands secrete their products into ducts.

What part of the heart's conduction system acts as the primary pacemaker?

Systole refers to the_ of the ventricles, when pressure is_.

Norepinephrine is released from_ neurons, causing heart rate to_.

Slow-twitch fibers have a oxidative capacity and glycogen content.