ANAT 100 EXAM 3 QUESTIONS AND
CORRECT ANSWERS!!
what is cardiac muscle
found in the heart, contracts rhymtically and is modulated by neural activity and hormones
What is smooth muscle
controlled by nervous system or hormones and may be either generally inactive and then respond
to stimulation or may be rhthymic
how can muscle be characterised by (2)
its morphology (form) or function
what is the two types of morphology for muscle
striated and smooth
what is striated muscle and where can it be found
marked by both light and dark bands (striations)
-found in heart and skeletal muscles
-long muscle fibres (cells) with multiple nuclei for skeletal and binucleated for cardiac
where are the nuclei in striated skeletal muscle versus in striated cardiac muscle
multiple nuclei located peripherally for skeletal muscle or centrally for cardiac muscle
see pic pg 22
intercalated discs of cardiac muscle
specialized connections between myocardial cells containing gap junctions and desmosomes
smooth muscle what does it look like and where can be found where
-has a smooth fusiform-shaped cell without striations
blood vessels, digestive system and other viscera
, where are the nucleus located in smooth muscle
a single centrally located nucleus -uninucleaated
muscle can be categorized functionally as what? (2)
voluntary or involuntary
what is voluntary muscle and the type
muscle that is consciously controlled in order to perform a specific function
--> skeletal muscle
what is involuntary muscle and the type
not consciously controlled (intestines and heart) so smooth and cardiac muscles
shape of muscle cells skeletal vs cardiac vs smooth
skeletal is long cylindrical rod
cardiac is branching
smooth is fusiform
How do muscles function
excitability and contractility
what is excitability vs contractility
excitability is the ability of muscle tissue to receive and respond to electrical signals from nerves
or stimulation from hormones
contractility refers to when a muscle cells is excited by a nerve or homone causing the muscle to
shorten and resulting in contraction
skeletal muscle functions to
-produce movement
-maintain posture and stabilize joins
CORRECT ANSWERS!!
what is cardiac muscle
found in the heart, contracts rhymtically and is modulated by neural activity and hormones
What is smooth muscle
controlled by nervous system or hormones and may be either generally inactive and then respond
to stimulation or may be rhthymic
how can muscle be characterised by (2)
its morphology (form) or function
what is the two types of morphology for muscle
striated and smooth
what is striated muscle and where can it be found
marked by both light and dark bands (striations)
-found in heart and skeletal muscles
-long muscle fibres (cells) with multiple nuclei for skeletal and binucleated for cardiac
where are the nuclei in striated skeletal muscle versus in striated cardiac muscle
multiple nuclei located peripherally for skeletal muscle or centrally for cardiac muscle
see pic pg 22
intercalated discs of cardiac muscle
specialized connections between myocardial cells containing gap junctions and desmosomes
smooth muscle what does it look like and where can be found where
-has a smooth fusiform-shaped cell without striations
blood vessels, digestive system and other viscera
, where are the nucleus located in smooth muscle
a single centrally located nucleus -uninucleaated
muscle can be categorized functionally as what? (2)
voluntary or involuntary
what is voluntary muscle and the type
muscle that is consciously controlled in order to perform a specific function
--> skeletal muscle
what is involuntary muscle and the type
not consciously controlled (intestines and heart) so smooth and cardiac muscles
shape of muscle cells skeletal vs cardiac vs smooth
skeletal is long cylindrical rod
cardiac is branching
smooth is fusiform
How do muscles function
excitability and contractility
what is excitability vs contractility
excitability is the ability of muscle tissue to receive and respond to electrical signals from nerves
or stimulation from hormones
contractility refers to when a muscle cells is excited by a nerve or homone causing the muscle to
shorten and resulting in contraction
skeletal muscle functions to
-produce movement
-maintain posture and stabilize joins
