dlatching Match each structure listed on the left with the correct description o
ID: 3520015 • Letter: D
Question
dlatching Match each structure listed on the left with the correct description on the right. Each term in the right-hand column may be used more than once. 1. muscle fiber membrane 2. cellular connections between cardiocytes 3. striated, uninucleated cells 4. muscle tissue in tip of tongue 5. muscle tissue in artery 6. voluntary muscle A. sarcolemma B. intercalated disc C. cardiac muscle D. skeletal muscle E. smooth muscle 7. nonstriated cells 8. involuntary, striated cells B. Short-Answer Questions 1. Which types of muscle tissue are striated? 2. Where in the body does smooth muscle occur? 3. What is the function of intercalated discs in cardiac muscle? 4. Which muscle tissues are controlled involuntarily?Explanation / Answer
1) Sarco means muscle and lemma means membrane. Thus Sarcolemma is the correct gap word.
2) Intercalated disc connects all cardiac cells and makes all cardiac myocytes contract at once. Intercalated disc is the correct gap word.
Further questions are more factual than conceptual.
Skeletal muscles are also called voluntary muscles. These are striated and uninucleated. These muscles help in voluntary movements like movement lf tongue and limbs. Thus for blanks 3, 4 and 6, correct gap word is skeletal muscle.
Smooth muscles are called smooth because they are not striated. They are non voluntary. Smooth muscles are present in places like in viscera or on walls of blood vessels.
Thus for blanks 5 and 7, smooth muscle is the correct gap word.
Cardiac muscles are involuntary and striated. Smooth muscles are involuntary but unstriated. Skeletal muscles are striated but voluntary.
Thus for 8, cardiac muscle is the correct gap word.
B)
1) Cardiac muscle cells and skeletal muscle cells are striated. Striations are due to ordered arrangement of actin and myosin in myofibrils.
2) Smooth muscles help regulate the housekeeping tasks in body. These are present in locations of automatic activity. Like in walls of stomach and intestine, in walls of blood vessels, urinary bladder, ureter, uteres.
3) The heart must work as a syncytium in order for it to contact at once and pump blood effectively. To ensure this, intercalated discs help in direct ionic diffusion and simultaneous contraction of cardiac myocytes.
4) Smooth muscles and cardiac muscles are involuntary in nature. Skeletal muscles are used for movement of skeletal conponents and thus are voluntary.
Smooth muscles and cardiac muscles perform such tasks, which are autoregulated by body. For example pumping of blood is done by heart is not under our control. Heart has certain pacemaker cells which automatically generate, control and maintain the heRt rhythm. Likewise, involuntary muscles are either controlled by medulla of brain or are controlled by local nervous system. They are not under conscious control.
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