Heart Histology Quiz for Students

What is the primary structural unit of cardiac muscle tissue?

• Sarcomere

• Myofibril

• Sarcolemma

• Intercalated disc

During which stage of heart development does the heart tube form?

• Gastrulation

• Neurulation

• Organogenesis

• Embryogenesis

Which animal has a four-chambered heart similar to humans?

• Fish

• Amphibians

• Birds

• Reptiles

What is the role of the sinoatrial (SA) node in cardiac electrical conduction?

• It delays the impulse to allow ventricular filling.

• It acts as the primary pacemaker of the heart.

• It conducts impulses to the Purkinje fibers.

• It connects the atria to the ventricles.

Which of the following is a common pathology affecting heart tissue?

• Osteoporosis

• Myocardial infarction

• Cirrhosis

• Nephritis

In which species is the heart rate typically the fastest?

• Elephant

• Horse

• Mouse

• Human

What is the function of intercalated discs in cardiac muscle?

• They store calcium ions.

• They facilitate electrical coupling between cells.

• They generate action potentials.

• They provide structural support to the heart.

Which embryonic structure gives rise to the heart?

• Neural crest

• Mesoderm

• Endoderm

• Ectoderm

How many chambers does a typical reptilian heart have?

• Two

• Three

• Four

• Five

What is the primary function of the atrioventricular (AV) node?

• To initiate the heartbeat

• To delay the electrical impulse

• To contract the ventricles

• To supply blood to the heart muscle