Question

The flight muscles in an eagle have more aerobic muscles. These muscles are also called red muscles because they are rich in
(a) Haemoglobin
(b) Sarcoplasmic reticulum
(c) Myoglobin
(d) Globin

Answer 1

The aerobic muscles are also called red muscles because they are rich in the substance which is an iron- and oxygen-binding protein that is present in vertebrate skeletal muscle tissue in general and in nearly all mammals.

Complete answer:
The muscle is a bundle of fibrous tissue in a body capable of contracting, shifting, or retaining the location of parts of the body.
Due to a pigment called myoglobin, muscles appear red. It receives oxygen from red blood cells and transfers it to muscle cell mitochondria, where oxygen is used for energy production in cellular respiration. Therefore, they are called aerobic muscles as well. As they are rich in myoglobin, these muscles are also called red muscles.
Thus, there are more aerobic muscles in the flight muscles of an eagle.

Additional Information: -Myoglobin can take forms such as oxymyoglobin (MbO2), carboxymyoglobin (MbCO), and metmyoglobin (met-Mb), similar to hemoglobin taking forms such as oxyhemoglobin (HbO2), carboxyhemoglobin (HbCO), and methemoglobin (met-Hb).
-Myoglobin is a cytoplasmic protein that binds oxygen to a group of hemes, much like hemoglobin. It has only one globulin community, while there are four in hemoglobin. Mb has a greater affinity for oxygen than hemoglobin, even though its heme group is similar to those in Hb. This distinction is due to its different role: while oxygen is carried by hemoglobin, the function of myoglobin is to store oxygen.
So, the answer is, “Myoglobin.”

Note: -In red blood cells, myoglobin is distantly linked to oxygen-binding proteins i.e., hemoglobin.
-High myoglobin concentrations in muscle cells allow for a longer period for organisms to hold their breath. Diving animals such as whales and seals have muscles with an exceptionally high myoglobin abundance.
-Myoglobin occurs in Type I, Type II-A, and Type II B muscles, but most texts consider that myoglobin does not occur in smooth muscles.