Muscle Physiology2 - MusclePhysiology RELAXATION...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
RELAXATION ENERGETICS OF CONTRACTION TENSION PRODUCTION Muscle Physiology
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
I. Relaxation A. The duration of a contraction depends on what 3 things? 1. Duration of stimulus at neuromuscular junction (Ach) 2. Presence of Ca ++ in the sarcoplasm 3. Availability of ATP A. The cessation of a contraction depends on 3 things too: 1. Stop stimulus at neuromuscular junction (remove Ach – by acteylcholinesterase) 2. Remove Ca ++ - transport back into SR 3. Availability of ATP
Background image of page 2
I. Energetics of Contraction muscle contraction requires enormous amounts of ATP: - during contraction: myosin activation/deactivation -during relaxation: active transport of Ca ++ back into SR A. Sources of Energy 1. ATP : Made by mitochondria, free in sarcoplasm, only enough for 2 sec of sustained activity
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
II. Energetics of Contraction, cont’d 1. Creatine Phosphate (CP): ATP isn’t a long term energy storing molecule, pretty unstable. So, excess ATP transfers its energy to a molecule called creatine ATP + Creatine ADP + CP 1. Glycogen: storage form of glucose Glucose can do one of two things: 1. enter aerobic cell respiration = 36 ATP 2. enter anaerobic cell respiration = 2 ATP
Background image of page 4
A. Activity and Energetics
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/27/2011 for the course BIO 180 taught by Professor Sarahbales during the Spring '11 term at Moraine Valley Community College.

Page1 / 15

Muscle Physiology2 - MusclePhysiology RELAXATION...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online