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Cardiac Muscles MDCAT MCQs with Answers

Cardiac Muscles MDCAT MCQs

Welcome to the Cardiac Muscles MDCAT MCQs with Answers. In this post, we have shared Cardiac Muscles Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Biology offers a chance to enhance your knowledge regarding Cardiac Muscles MCQs in this MDCAT Online Test.

The primary function of cardiac muscle is to: a) Move bones
b) Digest food
c) Pump blood
d) Secrete hormones

Answer
c) Pump blood

Cardiac muscle tissue is characterized by: a) Smooth fibers
b) Non-striated fibers
c) Striated fibers with intercalated discs
d) Multinucleated fibers

Answer
c) Striated fibers with intercalated discs

Cardiac muscle is controlled by: a) The autonomic nervous system
b) The somatic nervous system
c) The endocrine system
d) The peripheral nervous system

Answer
a) The autonomic nervous system

The intercalated discs in cardiac muscle function to: a) Increase muscle strength
b) Connect cardiac muscle cells
c) Store calcium
d) Provide ATP

Answer
b) Connect cardiac muscle cells

Cardiac muscle cells are: a) Branched and striated
b) Smooth and non-striated
c) Smooth and striated
d) Unbranched and striated

Answer
a) Branched and striated

The heart muscle is also known as: a) Skeletal muscle
b) Smooth muscle
c) Cardiac muscle
d) Striated muscle

Answer
c) Cardiac muscle

Which of the following is true about cardiac muscle? a) It is voluntary
b) It is multinucleated
c) It has a high endurance level
d) It has intercalated discs

Answer
d) It has intercalated discs

The intrinsic conduction system of the heart includes: a) Skeletal muscle fibers
b) Cardiac muscle fibers
c) Smooth muscle fibers
d) Tendon fibers

Answer
b) Cardiac muscle fibers

Which part of the heart has the pacemaker function? a) Atria
b) Ventricles
c) Sinoatrial (SA) node
d) Atrioventricular (AV) node

Answer
c) Sinoatrial (SA) node

Cardiac muscle cells have: a) No nuclei
b) Multiple nuclei
c) A single nucleus
d) A central nucleus

Answer
c) A single nucleus

The rhythmic contraction of the heart muscle is due to: a) Voluntary control
b) Hormonal control
c) Electrical impulses
d) Reflex actions

Answer
c) Electrical impulses

Which of the following is not a characteristic of cardiac muscle? a) Striations
b) Intercalated discs
c) Voluntary control
d) Branched fibers

Answer
c) Voluntary control

Cardiac muscle tissue can be found in the: a) Lungs
b) Heart
c) Liver
d) Digestive tract

Answer
b) Heart

The autonomic nervous system controls: a) Skeletal muscle
b) Cardiac muscle
c) Smooth muscle
d) All of the above

Answer
b) Cardiac muscle

The action potential in cardiac muscle cells is maintained by: a) Sodium and potassium channels
b) Calcium and sodium channels
c) Calcium and potassium channels
d) Chloride and sodium channels

Answer
b) Calcium and sodium channels

Cardiac muscle differs from skeletal muscle in that: a) It has intercalated discs
b) It is under voluntary control
c) It does not have striations
d) It has multiple nuclei per cell

Answer
a) It has intercalated discs

The cardiac muscle’s high endurance is due to: a) A large number of mitochondria
b) A high number of nuclei
c) The presence of intercalated discs
d) Smooth muscle fibers

Answer
a) A large number of mitochondria

The contraction of cardiac muscle is initiated by: a) Electrical impulses from the brain
b) Chemical signals from the blood
c) Electrical impulses from the heart’s own conduction system
d) Hormones from the endocrine system

Answer
c) Electrical impulses from the heart’s own conduction system

Cardiac muscle is primarily: a) Voluntary
b) Involuntary
c) Smooth
d) Striated

Answer
b) Involuntary

The function of the atrioventricular (AV) node is to: a) Initiate the heartbeat
b) Conduct electrical impulses to the ventricles
c) Pump blood
d) Relax the heart muscle

Answer
b) Conduct electrical impulses to the ventricles

Which type of muscle tissue has a slow, rhythmic contraction? a) Skeletal muscle
b) Smooth muscle
c) Cardiac muscle
d) Voluntary muscle

Answer
c) Cardiac muscle

The protein that binds calcium in cardiac muscle cells is: a) Troponin
b) Tropomyosin
c) Myosin
d) Actin

Answer
a) Troponin

The cardiac cycle consists of: a) Diastole and systole
b) Relaxation and contraction
c) Depolarization and repolarization
d) All of the above

Answer
a) Diastole and systole

Cardiac muscle cells are connected by: a) Synapses
b) Intercalated discs
c) Gap junctions
d) Desmosomes

Answer
b) Intercalated discs

The heart’s conduction system includes: a) The atrioventricular (AV) node
b) The sinoatrial (SA) node
c) The bundle of His
d) All of the above

Answer
d) All of the above

Which of the following helps the heart muscle resist fatigue? a) High levels of glycogen
b) High levels of myoglobin
c) High levels of collagen
d) High levels of calcium

Answer
b) High levels of myoglobin

Cardiac muscle contraction is regulated by: a) Skeletal nervous impulses
b) Hormonal signals
c) Electrical impulses from the heart
d) Voluntary control

Answer
c) Electrical impulses from the heart

The primary source of energy for cardiac muscle cells is: a) ATP
b) Glucose
c) Fatty acids
d) Amino acids

Answer
c) Fatty acids

Which structure is responsible for the rapid conduction of impulses through the ventricles? a) Bundle of His
b) Purkinje fibers
c) AV node
d) SA node

Answer
b) Purkinje fibers

The sinoatrial (SA) node is located in: a) Right ventricle
b) Left atrium
c) Right atrium
d) Left ventricle

Answer
c) Right atrium

The relaxation phase of the cardiac cycle is called: a) Systole
b) Diastole
c) Contraction
d) Repolarization

Answer
b) Diastole

The contraction phase of the cardiac cycle is known as: a) Systole
b) Diastole
c) Relaxation
d) Repolarization

Answer
a) Systole

The primary role of cardiac muscle intercalated discs is: a) Provide energy
b) Enable communication between cells
c) Store calcium
d) Facilitate muscle growth

Answer
b) Enable communication between cells

Which cardiac muscle feature allows for coordinated contraction? a) High number of mitochondria
b) Striations
c) Intercalated discs
d) Branching fibers

Answer
c) Intercalated discs

Cardiac muscle is found in which part of the body? a) Arms
b) Legs
c) Heart
d) Abdomen

Answer
c) Heart

The depolarization of cardiac muscle cells is associated with: a) Calcium influx
b) Potassium efflux
c) Sodium efflux
d) Chloride influx

Answer
a) Calcium influx

Cardiac muscle has: a) A high endurance due to numerous mitochondria
b) Limited endurance due to few mitochondria
c) Low endurance due to lack of mitochondria
d) High endurance due to smooth muscle fibers

Answer
a) A high endurance due to numerous mitochondria

The heart’s ability to contract and relax is due to: a) Action potentials
b) Hormones
c) Skeletal muscle contraction
d) Smooth muscle contraction

Answer
a) Action potentials

Which of the following is a characteristic of cardiac muscle cells? a) Branched appearance
b) Multinucleated
c) Non-striated
d) Smooth

Answer
a) Branched appearance

The heart’s electrical impulses are first generated by: a) The AV node
b) The SA node
c) The bundle of His
d) The Purkinje fibers

Answer
b) The SA node

The role of the cardiac conduction system is to: a) Regulate blood flow
b) Control muscle growth
c) Coordinate heart contractions
d) Deliver oxygen to tissues

Answer
c) Coordinate heart contractions

Cardiac muscle tissue is: a) Voluntary and striated
b) Involuntary and striated
c) Voluntary and smooth
d) Involuntary and smooth

Answer
b) Involuntary and striated

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