Why are RBCs efficient in their functions though they lack nucleus and mitochondria?

Pick the odd one out and name the category to which the remaining three belong: (a) Prothrombin, Thrombin, Fibrinogen, Albumin (b) Tonsils, Glomerulus, Spleen, Lymph nodes (c) Neutrophils, Basophils, Monocytes, Eosinophils (d) Leaves, Styrofoam, Grass, Cow dung (e) Pulmonary artery, Renal artery, Coronary artery, Hepatic artery

Carbon monoxide is dangerous when inhaled in excess. Comment on the statement.

Assertion (A): Leukoderma is the biological term for blood cancer. Reason (R): An abnormal increase in the number of WBCs causes blood cancer. (a) (A) is true and (R) is false. (b) (A) is false and (R) is true. (c) Both (A) and (R) are true and (R) is the correct explanation of (A). (d) Both (A) and (R) are true and (R) is not the correct explanation of (A).

During the ventricular systole, the atrioventricular valves (P) ............... and the semilunar valves (Q) ............... . (a) P-close and Q-open (b) P-close and Q-close (c) P-open and Q-close (d) P-open and Q-open

RBCs do not have nuclei. Discuss its advantage.

Which is the correct sequence of blood flow in the Pulmonary and Systemic circulation? (a) Right Atrium → Right Ventricle → Lungs → Left Atrium → Left Ventricle → Body tissues (b) Left Ventricle → Left Atrium → Body tissues → Right Atrium → Right Ventricle → Lungs (c) Left Ventricle → Left Atrium → Lungs → Right Ventricle → Right Atrium → Body tissues (d) Right Atrium → Right Ventricle → Body tissues → Left Atrium → Left Ventricle → Lungs

Define the term-Diapedesis.

Arrange the terms in each group in the correct order. Write them in a logical sequence beginning with the term that is underlined. (a) Palisade cells, Cuticle, Upper epidermis, Spongy cells. (b) Hepatic portal vein, Stomach, Hepatic vein, Liver. (c) Cyton, Dendrites, Synaptic cleft, Axon endings. (d) Insulin release, High blood sugar, Lowers blood sugar, Stimulates glucose uptake from blood. (e) Sperm duct, Seminiferous tubule, Epididymis, Efferent ducts.

The diagram below depicts the human heart in one of its phases. Answer the questions that follow: (a) Which part of the heart is in the contraction phase? (b) Give a suitable reason to justify your answer in (a). (c) Distinguish between Systole and Diastole.

Given below is the diagram of a human heart. Read the information below the diagram and fill in the blanks: The human heart pumps blood throughout the body. It is the size of a large fist. The heart is located between the lungs in the thoracic cavity. It has four chambers. The heart functions all through the lifespan of a person and is responsible for the survival of the person. The heart is enclosed by a membrane called (a) ............... . The ventricles give rise to two large blood vessels called (b) ............... and (c) ............... . The flaps of the cuspid valves are kept in position by (d) ............... . (e) ............... arteries supply oxygenated blood to the walls of the heart.

Name the mineral elements required for: (a) Clotting of blood (b) Synthesis of thyroxine