| A | B |
|---|
| The light appearing part of the sarcomere is the ___ ___. | I band |
| 2 additional names for skeletal muscle | Striated and voluntary |
| Striated means ___ | Striped |
| Muscle tissue that is striated and voluntary | Skeletal |
| Muscle tissue type that has many nuclei per fiber | Skeletal |
| Muscle tissue that is striated and involuntary | Cardiac |
| Muscle tissue with intercalated discs | Cardiac |
| Muscle tissue that is non-striated and involuntary | Smooth |
| Muscle tissue that is often found in sheets in the walls of hollow organs such as the stomach and the blood vessels | Smooth |
| Muscle tissue that is not under conscious control can be described as ____. | Involuntary |
| Name 2 types of muscle that are striated. | Skeletal & cardiac |
| Name 2 types of muscle tissue that are involuntary | Cardiac and smooth |
| Name two types of muscle tissue that have one nucleus per fiber | Smooth and cardiac |
| Name two types of muscle that have sarcomeres | Skeletal and cardiac |
| Connective tissue that wraps around the outside of each skeletal muscle and may also wrap around groups of muscles that work together | Deep fascia |
| Connective tissue wrapping around each skeletal muscle, below the deep fascia | Epimysium |
| Connective tissue that wraps around skeletal muscle fascicles | Perimysium |
| Connective tissue that wraps around each skeletal muscle fiber | Endomysium |
| Connective tissue that attaches muscle to bone | Tendon |
| Type of CT that makes up tendons | Dense regular |
| The place where motor neurons communicate with skeletal muscle fibers is the ___. | Neuromuscular junction |
| The neurotransmitter released in skeletal muscle is always ___. | Acetylcholine |
| The gap between the muscle fiber plasma membrane and the synaptic end bulb is the ___. | Synaptic cleft |
| The neurotransmitter is contained in ____ ____ of the synaptic end bulb. | Synaptic vesicles |
| The receptors for acetylcholine are located in the ____. | Motor end plate (special area of the sarcolemma) |
| The long extension of the motor neuron that connects the nerve cell to the muscle cell is the ___, which branches into ___ ___ when it reaches the area of the muscle. | Axon / axon terminals |
| The motor neuron and all the muscle fibers it controls are called a ___ ___. | Motor unit |
| True or false--muscles may have any number of motor units--from one to dozens. | False--no muscle has only one, and most have hundreds or thousands. |
| As the axon branches, each skeletal muscle fiber receives its own ___. | Axon terminal |
| The plasma membrane of a muscle fiber is called the ___. | Sarcolemma |
| The cytoplasm of a muscle fiber is called the ___. | Sarcoplasm |
| The part of a muscle fiber that corresponds to smooth ER is the ___. | Sarcoplasmic reticulum (SR) |
| The special protein inside skeletal muscle fibers that stores oxygen is ___. | Myoglobin |
| The organelles that contain the thick and thin filaments and give the striated appearance to skeletal and cardiac muscle are the ___. | Myofibrils |
| Thick filaments are made of ___ and attached to the ___ line. | Myosin / M line |
| Thin filaments are made of ___ and attached to the ___ line. | Actin / Z line (Z disc) |
| The crosswise compartments of the myofibrils of skeletal and cardiac muscle are the ___. | Sarcomeres |
| Heads (crossbridges) and ATPase are associated with ___. | Myosin / thick filaments |
| The 2 contractile proteins of skeletal muscle are: | Actin & myosin |
| The 2 regulatory proteins of skeletal muscle are: | Troponin and tropomyosin |
| The regulatory protein that actually covers the myosin binding sites is ___. | Tropomyosin |
| The regulatory protein that changes shape as calcium ions bind to it is ___. | Troponin |
| Myosin binding sites are found on __. | Thin filaments / actin |
| In a relaxed muscle, calcium levels in the sarcoplasm are : | VERY low |
| The I band contains: | Thin filaments only--no part of thicks |
| The A band contains: | Thick filaments plus overlap of thins |
| The H zone contains: | Thick filaments only--no overlap of thins |
| Inside body cells, including relaxed skeletal muscle, levels of ____ are high, levels of ____ are low, and the net charge is ___. | K+ / Na+ / negative |
| Where is the calcium of a relaxed skeletal muscle fiber? | In the SR |
| Calcium LEAVES the SR through ______ and ENTERS the SR through ____. | Passive calcium release channels / active transport pumps |
| The dark appearing part of the sarcomere is the ___ ___. | A band |
| The filaments that connect the ends of the thick filaments to the Z lines are the ___ filaments. | Titin |
| The muscle fibers that branch and interconnect with each other are ___ muscle. | Cardiac |
