ADSC 4300 Lecture Notes - Lecture 6: Longissimus, Muscle Hypertrophy, Myocyte

• School: University of Georgia
• Department: Animal and Dairy Sciences
• Course: ADSC 4300
• Professor: Liu

Document Summary

Hypertrophy vs. hyperplasia: the whole muscle hypertrophy can be done via muscle fiber hyperplasia and muscle fiber hypertrophy, negatively correlated. You cut a section perpendicularly to the muscle, and you count the # of cells: mus(cid:272)le fi(cid:271)ers are(cid:374)"t o(cid:374)l(cid:455) lo(cid:374)gitudi(cid:374)all(cid:455) distri(cid:271)uted, (cid:271)ut they are also oblique. It"s (cid:448)er(cid:455) hard to get a(cid:374) e(cid:454)a(cid:272)t # of (cid:373)us(cid:272)le fi(cid:271)ers. During a narrow window during prenatal development: after birth (postnatal), only maturation occurs; hypertrophy. Muscle fiber hyperplasia: postnatal, hyperplasia is minimal. Indeterminate growers: no predetermined mature size: examples: fish, gender, usually males have more number of muscle fibers at birth than females; not always though. Example: pigs: breed, a breed is a specific group of domestic animals having homogenous appearance, behavior, and/or other characteristics, domestic animals have more muscle fiber numbers because of genetic selection. & better nutrition: growth factors, transcription factors. A lot of protein such as: actin, myosin, tropomyosin, troponin, etc: dna can be transcribed to get rrna ribosome translation protein.