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Human Phys 2
| Question | Answer |
|---|---|
| The name given to the repeating functional units that cause striations in a skeletal muscle myofibril is "sarcomere." | true |
| During skeletal muscle contraction, the distance between the Z lines of a sarcomere decreases because of shortening of the thick and thin filaments. | false |
| During concentric contractions of skeletal muscle, the I band and H zone shorten but the A band stays the same. | true |
| What protein is the principal component of skeletal muscle thick filaments? | myosin |
| Muscle cells divide to increase muscle size as one grows. | false |
| Troponin: binds with calcium to allow sarcomere shortening. breaks down actin. forms the boundaries of a sarcomere. breaks down myosin. is an enzyme in the sarcomere. | binds with calcium to allow sarcomere shortening. |
| The energy for cross bridge cycling during muscle contraction is provided by: ATP acetylcholine calcium myosin troponin | ATP |
| What is bound to the myosin cross-bridge at the point indicated by the letter A.? ATP ADP + Pi Pi ATP + Pi | ATP |
| What event is happening between G. and F.? ATP releases myosin head from actin ATP is split Energy is released as mysoin releases ADP and Pi. Cross-bridge is energized | Energy is released as mysoin releases ADP and Pi. |
| For the event at G. to occur, what must be true? Calcium must be high Calcium must be low ATP must be bound ADP and Pi must be released | Calcium must be high |
| What event is happening between C. and B.? ADP and Pi are released Binding of ATP to detach myosin ATPase activity to energize myosin Release of ATP | not Binding of ATP to detach or release of ATP |
| Lactic acid is a waste product of… | glycolysis |
| This is the first form of metabolism used in a cell. | Creatine phosphate pathway |
| This is the most efficient type of metabolism. | Oxidative phosphorylation |
| This metabolism occurs in the mitochondria. | Oxidative phosphorylation |
| Makes 2 ATP per glucose molecule. | Glycolysis |
| Energy in a resting muscle is stored as ATP. | False |
| Glycolysis occurs in the cytosol. | True |
| Oxidative Phosphorylation relays on O2 , Amino Acid and protein. | True |
| If the adrenal glands were removed from a patient, his plasma cortisol levels would __________, secretion of CRH by the __________ would __________, and secretion of ACTH by the __________ would __________. | decrease; hypothalamus; increase; anterior pituitary gland; increase |
| High cortisol would lead to: | immune system inhibition |
| Cortisol is released from the cortex of the adrenal glands, and epinephrine and norepinephrine are released from the medulla. | true |
| Thyroid Hormone is produces by thyroid gland but it gets stimulated by high level of TSH level in plasma. | true |
| Which of the following statements is true of the endocrine system? It's one of two major regulatory systems of the body It is composed of glands that secrete chemical messengers into the blood It is an important regulator of homeostatic mechanisms all | all are correct |
| Which does NOT apply to hormones? chemical regulators->from organ to organ via bloodstream All derived->cholesterol secreted->blood by ductless glands sometimes secreted by neural tissue sometimes function as local regulators or neurotransmitters | All hormones are derived from cholesterol. |
| Which does apply to hormones? chemical regulators->conveyed from organ to organ via bloodstream carried by blood to target cells which have receptors for it secreted by endocrine gland not exocrine can be steroids, amino acids/ proteins all | all are correct |
| which answers are characteristics of the endocrine system, and not the nervous system. Electrical impulses Messages travel slowly Response is fast Effects are long lasting Messengers travel through blood Messages travel quickly Response is slow | Messages travel slowly Effects are long lasting Messengers travel through blood Response is slow |
| Exocrine glands secreted hormones into capillary and carried away in the blood | false |
| skeletal muscle, smooth muscle, or both types? Increase in Ca++ is key step for Excitation -Contraction coupling process | both |
| skeletal muscle, smooth muscle, or both types? Regulates blood flow and blood pressure because it makes the wall of blood | smooth |
| skeletal muscle, smooth muscle, or both types? T-tubules are present | skeletal |
| skeletal muscle, smooth muscle, or both types? Troponin is present | skeletal |
| skeletal muscle, smooth muscle, or both types? Relies on Ca++ from both inside and outside of the cell | smooth |
| skeletal muscle, smooth muscle, or both types? Uses ATP to power cross-bridge cycling | both |
| skeletal muscle, smooth muscle, or both types? Has striations | skeletal |
| skeletal muscle, smooth muscle, or both types? Has dense bodies | smooth |
| Smaller motor units are associated with finer control of muscle tension, and coarse, powerful movements are associated with muscles with large motor units | true |
| You would find more FG fibers in the eye muscles compared to leg muscles. | false |
| The force that a whole muscle exerts is based on which? the stimulation frequency of each fiber the total number of fibers contracting at once all how many motor units have been recruited the state of fatigue of individual muscle fibers | all of these can contribute |
| Where would you NOT find smooth muscle? bladder hands iris of eye uterus | hands |
Created by:
alaynak