Chapter 9 The Muscular System

Which of the following connective tissues divides the muscle into a series of internal compartments with fascicles? a) epimysium b) endomysium c) aponeuroses d) perimysium

perimysium

convergent muscles have fibers that are

widespread and join at a common attachment site

Which of the following is the correct sequential list of the connective tissue coverings going from superficial to deep

epimysium, perimysium, endomysium

Action potentials travel quickly from one cardiac cell to another due to which of the following?

gap junctions and intercalated discs

Which of the following statements regarding thin filaments is TRUE?

Each thin filament consists of a twisted strand 5 to 6 nm in diameter and 1 micrometer in length

Which of the following statements regarding origins and insertions is TRUE?

If there are several tendons at one end and just one at the other, there are multiple origins and a single insertion.

Which of the following statements regarding aging and the muscular system is TRUE?

Regular exercise is more important than extremely demanding exercise in maintaining a healthy musculoskeletal system

Which of the following effects of aging on the muscular system is TRUE?

Skeletal muscle fibers' diameter decrease in size, primarily due to reduction in number of myofibrils.

A unit of muscle structure that is composed of myofibrils, is enclosed within a sarcolemma, and is surrounded by endomysium is a _______ a) myofibril b) muscle fiber c) myofilament d) fascicle

muscle fiber