Human Anatomy - Thorax Worksheet 3

Which of the following is a function of the fibrous skeleton of the heart? distributes the forces of contraction provides instructions for cardiac muscle cells to contract maintains the energy reserves in the form of glycogen and lipid inclusions provides full range mobility to the valves of the heart physically connects the atrial muscle cells to the ventricular muscle cells

distributes the forces of contraction

The extensive connective tissue network, which encircles the bases of the pulmonary trunk and aorta and the valves of the heart, is called the ________ of the heart. fibrous skeleton endocardium intercalated network pericardium pulmonary epicardium

fibrous skeleton

Each lung consists of approximately how many alveoli? 100,000 one billion 500,000 150 million 100 billion

150 million

Each semilunar valve consists of the following: a ring of connective tissue that attaches to the fibrous skeleton of the heart; connective tissue cusps, which function to close the opening between the heart chambers; and chordae tendineae that attach the margins of the cusps to the papillary muscles of the heart wall. True False

False

Cardiac muscle cells obtain energy almost exclusively through ________. anaerobic pathways aerobic respiration glycolysis the Krebs cycle protein reserves

aerobic respiration

Externally, the posterior and inferior portions of the left ventricle form the ________. sternocostal surface right border left border diaphragmatic surface superior border

diaphragmatic surface

Which is the deepest and innermost layer of the heart wall? parietal layer of the epicardium endocardium myocardium fibrous pericardium visceral layer of the epicardium

endocardium

The visceral pericardium is also called the ________. endocardium parietal pericardium epicardium myocardium fibrous pericardium

epicardium

The anterior portion of the nasal septum is formed of ________. fibrocartilage hyaline cartilage elastic cartilage pseudostratified ciliated columnar epithelium spongy bone

hyaline cartilage

Which artery supplies the pericardium? axillary radial brachial vertebral internal thoracic

internal thoracic

Structures in the heart that carry electrical signals from the SA node to the AV node are called ________. internodal pathways bundle branches Purkinje fibers chordae tendineae moderator bands

internodal pathways

The left lung is longer than the right lung because the diaphragm rises on the right side to accommodate which structure? liver spleen heart large intestine stomach

liver

Which features are described as prominent muscular ridges that extend along the inner surface of the right auricle and across the adjacent anterior wall of the right atrium? chordae tendineae foramina ovale papillary muscles pectinate muscles trabeculae carneae

pectinate muscles

Which of the following is a unique feature of the right ventricle? mitral valve papillary muscles aorta pulmonary trunk trabeculae carneae

pulmonary trunk

The ________ of the heart includes the bases of the major vessels. right border inferior border left border superior border diaphragmatic surface

superior border

Blood that occurs to and from all of the tissues of the body, with the exception of the lungs, is transported in the ________. infundibular circuit pulmonary circuit systemic circuit hepatic portal circuit arterial circle of Willis

systemic circuit

Which of the following cartilages is C-shaped? cricoid thyroid tracheal corniculate arytenoid

tracheal