Answer:
The correct option is d. All of the above contribute to the pinal gland being called the body's timekeeper.
Explanation:
The pineal gland is a reddish-grey pine-cone shape gland present in the brain. It is responsible for the production of melatonin. The melatonin is a hormone which controls the body's sleep cycle and the circadian rhythm.
The melatonin production is stimulated by darkness. Therefore, the melatonin levels are low during the days and increases at night. This helps in regulating the body's sleep cycle and the circadian rhythm.
Thus, the pineal gland is referred to as the body's timekeeper.
Answer:
a risk factor is a variable that increases your risk for a disease.
ex. being a smoker is a risk factor for lung cancer.
Answer: NO, the size of the particles does not interfere with the renal circulatory volume, but it does with the glomerular filtration process.
Explanation:
Glomerular filtration has mechanisms to precisely control the volume of glomerular circulation, thus there are intrinsic mechanisms such as renal self-regulation in which the kidney adjusts the dilation or construction of the afferent arterioles and extrinsic mechanisms such as neuronal control performed by the nervous system and Hormonal control, such as the renin-angiotensin-aldosterone system, which regulates blood pressure and fluid balance, particles in the blood that are too large can affect the renal system, but their ionic charge and size can be reduced it passes through the tubules of the nephron into the urine, which prevents them from leaking, however, this is not an impediment for them to circulate in the renal blood system.
Answer:
tunica intima (inner layer)
Explanation:
Walls of veins is composed of three layers, which are:
- A. Outer layer (tunica adventitia) is of connective tissue with the collagen fibers.
- B. Middle layer (tunica media) is of smooth muscle which are arranged circularly and the elastic fibers.
- <u>C.Inner layer (tunica intima) which consists of specialized simple squamous epithelium which are also known endothelium which lines all the blood vessels and endocardium of heart.</u>
