Are cell membranes more permeable to lipid-soluble or water-soluble substances?
Lipid-soluble substances
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| Term | Definition |
|---|---|
| Are cell membranes more permeable to lipid-soluble or water-soluble substances? | Lipid-soluble substances |
| large protein responsible for passive elasticity (two names for it) | Titin (also known as connectin) |
| what is the largest sinle polypeptide? | Titin/connectin |
| Band within sarcomere that is dark and does not move during contraction | A band |
| Band within sarcomere that is light and moves during muscle contraction | I band |
| which parts interdigitate to make a muscle contract | actin and myosin |
| covers active sites and prevents interaction with myosin | |
| Troponin I binds what? Troponin T binds? and Troponin C binds? | Actin, tropomyosin, calcium |
| Which Troponin subunit binds to create a conformational change to allow myosin to bind to actin | Troponin-C (calcium binds) |
| How many binding sites does myosin have and what are they | two- ATP and actin |
| How many heads does one myosin molecule have | two |
| How many light and heavy chains does myosin have | two heavy and four light |
| What does calcium bind to in the muscle cell | troponin |
| Explain the four stages of the "Walk-Along Theory" | 1. myosin head binds to actin (new ATP comes in and causes) 2. Myosin head to release from actin (ATP hydrolysis which causes) 3. Myosin head to become cocked/active (ADP and Pi) 4. Myosin head attaches to actin and pulls =power stroke (ADP bound) |
| Explain Rigor Mortis | less O2 available after death, so decrease in ATP, no more ATP cant cause conformational change to pull myosin off actin so stuck in rigor state |
| AT= TT-PT Explain this equation | active tension cannot be measured directly. but passive and total tension can. so this equation calculate |
| T or F: active tension falls away linearly with increasing length (as well as with decreasing length) | True |
| Isotonic vs isometric | Isotonic: muscle changes length to contract heavy object Isometric: object to heavy muscle cannot change length when contracts |
| Define motor unit | it is the motor neuron and all of the muscle fibers that it innervates |
| What type of skeletal muscle: slow, oxidative, red muscle, low glycolytic enzyme content, lots of mitochondria, small diameter, lots of myoglobin | Type I |
| What type of skeletal muscle: glycolytic, fast, larg diameter, white muscle, few mitochondria, |