The iris is a pigmented muscular curtain found near the front of the eye and between the cornea and lens. It is perforated by an opening known as the pupil. The location of the iris is found in front of the eye lens and the ciliary body and posterior to the cornea. It is bathed in a fluid called as the aqueous humor.
The iris consists of two sheets of smooth muscles with opposing actions: dilation/expansion and contraction/constriction. The primary function of these muscles is tho control the size of the pupil and modulates how much light reaches the sensory tissue of the retina. The sphincter muscle of the iris is a rounded muscle that constricts the pupil whenever there is a bright light, whereas the dilator muscle expands the eye opening when it contracts.
Therefore, the answer is D. SMOOTH AND INVOLUNTARY because first of all the types of muscles that comprises the muscles in the iris are smooth and it is involuntary because they eyes auto-regulates the light that comes to it without our conscious effort.
This is false!
Carbon is found in many substances!
For example, we breathe out carbon (Carbon dioxide) and as a result, there is an amoung of carbon in the air.
Carbon is also found in many rock types, such as in coal.
Answer:
Peptide bonds are formed by hydrolysis or losing a water (H₂O)
Explanation:
Two or more amino acids are linked by forming peptide bonds, and then eventually form polypeptides. These peptide bonds are <u>covalent </u>in nature and require water. an amino group and a carboxyl group to form. These components then undergo hydrolysis to form long-chain amino acids.
The sequence of the amino acid chain <u>starts with the α-amino group residue and with an α-carboxyl group as the terminal residue</u>. This chain is also known as the primary structure of the protein molecule.
The prefrontal cortex of the brain deteriorates more quickly than other areas of the brain. The prefrontal cortex is a part of the brain situated at the front of the frontal lobe. It is drawn in in a variability of complex actions together with planning and greatly contributes to personality growth.
The answer is "the ice-caps" from the north and south pole.
