Integumentary System
Chapter 5
Muscular exercise enhances circulation to skin and improves
skin health
Skin protects the muscles by external enclosure; helps dissipate
heat generated by the muscles
Skeletal System
Chapters 6–8
Skeletal muscle activity maintains bone health and strength
Bones provide levers for muscle activity
Nervous System
Chapters 11–15
Facial muscle activity allows emotions to be expressed
Nervous system stimulates and regulates muscle activity
Nervous system activity maintains muscle mass
S Y S T E M
C O N N E C T I O N S
Homeostatic Interrelationships Between the
Muscular System
and Other Body Systems
Endocrine System
Chapter 16
Growth hormone and androgens influence skeletal muscle
strength and mass; other hormones help regulate cardiac
and smooth muscle activity
Cardiovascular System
Chapters 17–19
Skeletal muscle activity increases efficiency of cardiovascular
functioning; helps prevent atherosclerosis and causes cardiac
hypertrophy
Cardiovascular system delivers needed oxygen and nutrients
to muscles
Lymphatic System/Immunity
Chapters 20–21
Physical exercise may enhance or depress immunity depending
on its intensity
Lymphatic vessels drain leaked tissue fluids; immune system
protects muscles from disease
Respiratory System
Chapter 22
Muscular exercise increases respiratory capacity and efficiency
of gas exchange
Respiratory system provides oxygen and disposes of carbon
dioxide
Digestive System
Chapter 23
Physical activity increases gastrointestinal motility and
elimination when at rest
Digestive system provides nutrients needed for muscle health;
liver metabolizes lactic acid
Urinary System
Chapters 25–26
Physical activity promotes normal voiding behavior; skeletal
muscle forms the voluntary sphincter of the urethra
Urinary system disposes of nitrogenous wastes
Reproductive System
Chapter 27
Skeletal muscle helps support pelvic organs (e.g., uterus); assists
erection of penis and clitoris
Testicular androgen promotes increased skeletal muscle
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